How Meghan Markle won over Prince Philip with this strategic move: Report

We know that royal-to-be Meghan Markle won over the Queen back in the fall, but what about Prince Harry's grandfather, Prince Philip?

The retired royal has an especially close bond to Harry, so his approval likely means just as much to Harry as the queen's, and the UK's Express reported this week that Markle has indeed won him over -- and she used a little trick to seal the deal.

According to a palace insider quoted by the British outlet, Markle first really got to spend time with the Duke of Edinburgh at Sandringham over the Christmas holiday. Queen Elizabeth famously broke royal protocol by inviting Markle to spend the holiday with the royals -- an invitation normally reserved for people that have officially married into the family.

The source told Express that Markle slyly asked Philip all about his own personal history, including his Greek roots. The duke was part of Danish and Greek royalty before giving up those titles to marry the queen in 1947.

See photos of Meghan Markle and Prince Harry:

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Prince Harry and Meghan Markle together
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Prince Harry and Meghan Markle together
Britain's Prince Harry (R) and his fiancee US actress Meghan Markle, arrive to attend a reception with delegates from the Commonwealth Youth Forum in central London on April 18, 2017, on the sidelines of the Commonwealth Heads of Government meeting (CHOGM). / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
Britain's Prince Harry (2R) and his fiancee US actress Meghan Markle (C), arrive to attend a reception with delegates from the Commonwealth Youth Forum in central London on April 18, 2017, on the sidelines of the Commonwealth Heads of Government meeting (CHOGM). / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
LONDON, ENGLAND - APRIL 18: Meghan Markle and Prince Harry attend a reception with delegates from the Commonwealth Youth Forum during the Commonwealth Heads of Government Meeting at the Queen Elizabeth II Conference Centre on April 18, 2018 in London, England. (Photo by Chris Jackson/Getty Images)
BATH, ENGLAND - APRIL 06: Prince Harry and Meghan Markle attend the UK Team Trials for the Invictus Games Sydney 2018 at University of Bath on April 6, 2018 in Bath, England. (Photo by Samir Hussein/WireImage)
BATH, ENGLAND - APRIL 06: Prince Harry and Meghan Markle attend the UK Team Trials for the Invictus Games Sydney 2018 at University of Bath on April 6, 2018 in Bath, England. (Photo by Samir Hussein/WireImage)
BATH, UNITED KINGDOM - APRIL 06: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan Markle and Prince Harry attend the UK Team Trials for the Invictus Games Sydney 2018 at the University of Bath on April 6, 2018 in Bath, England. (Photo by Max Mumby/Indigo/Getty Images)
BELFAST, NORTHERN IRELAND - MARCH 23: Prince Harry and Meghan Markle visit Catalyst Inc, Northern Ireland�s next generation science park, to meet young entrepreneurs and innovators on March 23, 2018 in Belfast, Nothern Ireland. (Photo by Chris Jackson - Pool/Getty Images)
BELFAST, UNITED KINGDOM - MARCH 23: Prince Harry (R) and Meghan Markle interact with the crowd as they depart from to the Crown Liquor Saloon during their visit to Northern Ireland on March 23, 2018 in Belfast, Northern Ireland, United Kingdom. (Photo by Charles McQuillan/Getty Images)
LISBURN, NORTHERN IRELAND - MARCH 23: Prince Harry and Meghan Markle visit the Eikon Centre and attend an event to mark the second year of the youth-led peace-building initiative 'Amazing the Space' on March 23, 2018 in Lisburn, Nothern Ireland. (Photo by Arthur Edwards - WPA Pool/Getty Images)
EDINBURGH, SCOTLAND - FEBRUARY 13: Prince Harry and Meghan Markle are seen during a walkabout on the esplanade at Edinburgh Castle with Prince Harry on February 13, 2018 in Edinburgh, Scotland. (Photo by Andrew Milligan - WPA Pool/Getty Images)
EDINBURGH, SCOTLAND - FEBRUARY 13: Prince Harry and Meghan Markle visit Social Bite, a cafe that donates all profits to social causes, during their first official joint visit to Scotland on February 13, 2018 in Edinburgh, Scotland. (Photo by Samir Hussein/Samir Hussein/ WireImage)
Prince Harry and Meghan Markle during a walkabout on the esplanade at Edinburgh Castle, during their visit to Scotland. (Photo by John Linton/PA Images via Getty Images)
Prince Harry and Meghan Markle arrive to attend the annual Endeavour Fund Awards at Goldsmiths' Hall in London, to celebrate the achievements of wounded, injured and sick servicemen and women who have taken part in sporting and adventure challenges over the last year. (Photo by John Stillwell/PA Images via Getty Images)
Britain's Prince Harry (R) and his fiancee US actress Meghan Markle (L) arrive to attend the annual Endeavour Fund Awards at Goldsmiths' Hall in London on February 1, 2018. Prince Harry and Meghan Markle attended the second annual Endeavour Fund Awards ceremony in London. The Endeavour Fund Awards celebrate the achievements of wounded, injured and sick veterans who have taken part in remarkable sporting and adventure challenges as part of their recovery and rehabilitation. / AFP PHOTO / POOL / Ben STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
Prince Harry and Meghan Markle arrive to attend the annual Endeavour Fund Awards at Goldsmiths' Hall in London, to celebrate the achievements of wounded, injured and sick servicemen and women who have taken part in sporting and adventure challenges over the last year. (Photo by John Stillwell/PA Images via Getty Images)
Britain's Prince Harry (R) and his fiancee US actress Meghan Markle (L) arrive to attend the annual Endeavour Fund Awards at Goldsmiths' Hall in London on February 1, 2018. Prince Harry and Meghan Markle attended the second annual Endeavour Fund Awards ceremony in London. The Endeavour Fund Awards celebrate the achievements of wounded, injured and sick veterans who have taken part in remarkable sporting and adventure challenges as part of their recovery and rehabilitation. / AFP PHOTO / POOL AND AFP PHOTO / Ben STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
CARDIFF, WALES - JANUARY 18: Prince Harry and his fiancee Meghan Markle sign autographs and shake hands with children as they arrive to a walkabout at Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Prince Harry and Meghan Markle during a visit to Cardiff Castle. (Photo by Andrew Matthews/PA Images via Getty Images)
CARDIFF, WALES - JANUARY 18: Prince Harry and his fiancee Meghan Markle are seen during a walkabout at Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Karwai Tang/Karwai Tang/WireImage)
CARDIFF, WALES - JANUARY 18: Prince Harry and his fiancee Meghan Markle meet well wishers as they arrive to a walkabout at Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Ben Birchall - WPA Pool/Getty Images)
CARDIFF, WALES - JANUARY 18: Prince Harry and his fiancee Meghan Markle are seen during a walkabout at Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - JANUARY 09: Prince Harry and Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Neil Mockford/GC Images)
LONDON, ENGLAND - JANUARY 09: Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JANUARY 09: Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JANUARY 09: Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JANUARY 09: Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Chris Jackson/Getty Images)
Prince Harry and Meghan Markle arriving for a visit to youth-orientated radio station, Reprezent FM, in Brixton, south London to learn about its work supporting young people. (Photo by Yui Mok/PA Images via Getty Images)
The Duke and Duchess of Cambridge, Meghan Markle and Prince Harry leave the Christmas Day morning church service at St Mary Magdalene Church in Sandringham, Norfolk. (Photo by Joe Giddens/PA Images via Getty Images)
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) and Britain's Prince Harry (R) stand together as they wait to see off Britain's Queen Elizabeth II after attending the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
(Left-right front) Lady Louise Windsor, the Duke of Edinburgh, (left-right centre) The Duke and Duchess of Cambridge, Meghan Markle and Prince Harry arriving to attend the Christmas Day morning church service at St Mary Magdalene Church in Sandringham, Norfolk. (Photo by Joe Giddens/PA Images via Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
TOPSHOT - (L-R) US actress and fiancee of Britain's Prince Harry Meghan Markle and Britain's Prince Harry arrive to attend the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: (L-R) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
Prince Harry and Meghan Markle arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Jonathan Brady/PA Images via Getty Images)
LONDON, ENGLAND - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle arrive for the Queen's Christmas lunch at Buckingham Palace on December 20, 2017 in London, England. (Photo by Karwai Tang/WireImage)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and Meghan Markle go on a walk about at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Samir Hussein/Samir Hussein/WireImage)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and Meghan Markle go on a walk about at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Samir Hussein/WireImage)
NOTTINGHAM, UNITED KINGDOM - DECEMBER 01: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend a Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Max Mumby/Indigo/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and fiancee Meghan Markle attend the Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Karwai Tang/WireImage)
Britain's Prince Harry and his fiancee, US actress Meghan Markle gesture during their visit to Nottingham Academy in Nottingham, central England, on December 1, 2017. Prince Harry and his American actress fiancee Meghan Markle were welcomed by hundreds of people on their first royal visit as a couple since announcing their engagement this week. / AFP PHOTO / POOL / Andy Stenning (Photo credit should read ANDY STENNING/AFP/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and his fiancee US actress Meghan Markle pose for a photograph with the cast and crew of a hip hop opera performed by young people involved in the Full Effect programme at the Nottingham Academy school on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and his fiancee US actress Meghan Markle visit the Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Adrian Dennis - WPA Pool/Getty Images)
Britain's Prince Harry and his fiancee US actress Meghan Markle greet wellwishers on a walkabout as they arrive for an engagement at Nottingham Contemporary in Nottingham, central England, on December 1, 2017 which is hosting a Terrence Higgins Trust World AIDS Day charity fair. Prince Harry and Meghan Markle visited Nottingham in their first set of engagements together since announcing their engagement. / AFP PHOTO / Oli SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Karwai Tang/WireImage)
LONDON, UNITED KINGDOM - NOVEMBER 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens, Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens, Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Getty Images)
TORONTO, ON - SEPTEMBER 30: Meghan Markle and Prince Harry are seen at the Closing Ceremony on day 8 of the Invictus Games Toronto 2017 at the Air Canada Centre on September 30, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 30: Meghan Markle and Prince Harry are seen on day 8 of the Invictus Games Toronto 2017 on September 30, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend wheelchair tennis on day 3 of the Invictus Games Toronto 2017 on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Samir Hussein/Samir Hussein/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend wheelchair tennis on day 3 of the Invictus Games Toronto 2017 on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Samir Hussein/WireImage)
TORONTO, ON - SEPTEMBER 25: Prince Harry (R) and Meghan Markle (L) attend a Wheelchair Tennis match during the Invictus Games 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Prince Harry (R) and Meghan Markle (L) attend a Wheelchair Tennis match during the Invictus Games 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation)
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"The Duke of Edinburgh really got on with her," the source said. "The reason he liked her was because she was very bold. Meghan asked a lot of questions about Philip's side of the family and his connection to Greece."

While the tactic clearly worked to her advantage, the royal insider was unsure whether she came up with it on her own or if fiancé Prince Harry gave her the tip.

"Was she told to say that by Prince Harry? I don't know," the source said. "But she got really involved in the conversation."

Meghan Markle and Prince Harry are set to wed on May 19 at Windsor Castle, with Prince Philip scheduled in attendance despite having recently cancelled two consecutive public appearances for health reasons.

See photos of Prince Philip:

42 PHOTOS
Prince Philip, Duke of Edinburgh through the years
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Prince Philip, Duke of Edinburgh through the years
Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London on August 2, 2017. Prince Philip, the 96-year-old husband of Queen Elizabeth II, conducted his final solo public engagement on August 2, 2017, overseeing a military parade in the pouring rain before retiring from a lifetime of service. The Duke of Edinburgh, wearing a raincoat and bowler hat, met members of the Royal Marines and veterans -- many younger than him -- before taking the salute in the forecourt of Buckingham Palace. / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
LONDON, ENGLAND - AUGUST 02: Prince Philip, Duke of Edinburgh attends The Captain General's Parade at Buckingham Palace on August 2, 2017 in London, England. (Photo by Jeff Spicer/Getty Images)
Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London on August 2, 2017. Prince Philip, the 96-year-old husband of Queen Elizabeth II, conducted his final solo public engagement on August 2, 2017, overseeing a military parade in the pouring rain before retiring from a lifetime of service. The Duke of Edinburgh, wearing a raincoat and bowler hat, met members of the Royal Marines and veterans -- many younger than him -- before taking the salute in the forecourt of Buckingham Palace. / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
LONDON, UNITED KINGDOM - MARCH 13: Prince Philip, Duke of Edinburgh arrives for a Commonwealth Day Service at Westminster Abbey on March 13, 2017 in London, United Kingdom. (Photo by Ben Stanstall - WPA Pool/Getty Images)
ASCOT, ENGLAND - JUNE 14: Queen Elizabeth II, and Prince Philip, the Duke of Edinburgh, with Prince Harry, attend the first day of The Royal Ascot race meeting on June 14, 2016 in Ascot, England.(Photo by Julian Parker/UK Press via Getty Images)
ALDERSHOT, ENGLAND - MARCH 30: Prince Philip, The Duke Of Edinburgh in his capacity of Colonel, Grenadier Guards meets with officers from 1st Battalion Grenadier Guards before having a lunch in their Mess at Lille Barracks in Aldershot, England on March 30, 2017. The Duke of Edinburgh on Thursday presented the Manchester Trophy to the winners of the Manchester Cup, met Sergeants' in their Mess and stayed for lunch in the Officers' Mess. (Photo by Matt Dunham - WPA Pool /Getty Images)
UNITED KINGDOM - JULY 26: Princess Diana and Prince Philip in Windsor, United Kingdom on July 26th , 1987. (Photo by Eric BOUVET/Gamma-Rapho via Getty Images)
Britain's Prince Philip chats to Prince William at the Magna Carta 800th Anniversary Commemoration in Runnymede, June 15, 2015. REUTERS/Chris Jackson/Pool
LONDON - JUNE 17: (L-R) Prince Philip, Duke of Edinburgh, Prince Harry and Princess Anne, The Princess Royal look on from the balcony during The Queen's Birthday Parade and Trooping The Colour at Buckingham Palace on June 17, 2006 in London, England. (Photo by Anwar Hussein/Getty Images)
Britain's Prince Philip visits Lord's Cricket Ground where he opened the new Warner Stand, in London, May 3, 2017. REUTERS/Arthur Edwards/Pool
LONDON - MAY 24: (L-R) Queen Elizabeth II, US President Barack Obama, Michelle Obama and Prince Philip, Duke of Edinburgh arrive for a state banquet at Buckingham Palace on May 24, 2011 in London, England. (Photo by Rota/Anwar Hussein/Getty Images) *
The husband of Queen Elizabeth II of England, Prince Philip, The Duke of Edinburgh, on the occasion of his 60th birthday in 1981.
Princess Elizabeth and the Duke of Edinburgh arm in arm. 28th November 1947. (Photo by Daily Mirror/Mirrorpix/Mirrorpix via Getty Images)
WINDSOR, UNITED KINGDOM - MAY 11: Prince Philip At The Royal Windsor Horse Show Happy Informal (Photo by Tim Graham/Getty Images)
Prince Philip of Greece, later Duke of Edinburgh, as a toddler, July 1922. (Photo by Hulton Archive/Getty Images)
LONDON, ENGLAND - SPETEMBER 6: (FILE PHOTO) Prince Philip, the Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and Prince Charles, the Prince of Wales follow the coffin of Diana, Princess of Wales this in September 6, 1997 file photo in London, England. The funeral took place seven days after she was killed in an automobile accident in Paris. Members of the royal family walked in the procession behind the coffin, as did 500 representatives of the charities associated with the Princess. At least a million people lined the streets of central London to watch the procession from Kensington Palace to Westminster Abbey. (Photo by Anwar Hussein/Getty Images)
Princess Elizabeth and her husband Phillip, Duke of Edinburgh at Buckinham Palace after their marriage at Westminster Abbey, 1947. (Photo by � Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 18: Queen Elizabeth ll and Prince Philip, Duke of Edinburgh attend the State Opening of Parliament on November 18, 1979 in London, England. (Photo by Anwar Hussein/Getty Images) *** Prince Philip, Duke of Edinburgh;Queen Elizabeth II
Britain's Prince Philip, Duke of Edinburgh leaves after attending a Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England on December 25, 2016. / AFP / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
A royal family visit to a museum in Sandringham, where the children climb on a fire engine, January 1988. From left to right Prince Charles, Princess Diana, Queen Elizabeth, Peter Philips, Prince Philip, Duke of Edinburgh, Prince Harry, wearing a blue coat, Zara Phillips and Prince William. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
CANADA - OCTOBER 26: Royal Family - Philip; Duke of Edinburgh (1978- 1981) (Photo by Reg Innell/Toronto Star via Getty Images)
Britain's Queen Elizabeth (2nd R) , U.S. President Barack Obama, Camilla (L), the Duchess of Cornwall and Prince Philip (R), the Duke of Edinburgh attend a State Banquet in Buckingham Palace in London May 24, 2011. Obama was treated to royal pomp at Buckingham Palace Tuesday on a two-day state visit aimed at ensuring the United States and Britain keep the "special" in their relationship. REUTERS/Lewis Whyld/PA Wire/Pool (BRITAIN - Tags: POLITICS ROYALS)
Prince Philip, the Duke of Edinburgh with his son Prince Andrew during their tour of Africa, 1979. (Photo by Serge Lemoine/Getty Images)
WINDSOR, ENGLAND - MAY 15: Prince Philip, Duke of Edinburgh takes part in carriage driving at the Royal Windsor Horse Show on May 15, 1980 in Windsor, England. (Photo by Anwar Hussein/Getty Images)
LONDON, UNITED KINGDOM - JUNE 014: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh and Prince Harry watch the fly-past from the balcony of Buckingham Palace during Trooping the Colour, Queen Elizabeth II's Birthday Parade on June 14, 2014 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
COWES - AUGUST 1: Prince Philip the Duke of Edinburgh sailing his Yeoman class yacht as he competes for the Queens Cup at Cowes Regatta on August 1, 1982. (Photo by David Levenson/Getty Images)
Britain's Prince Philip, the Duke of Edinburgh leaves the National Army Museum in London, Britain March 16, 2017. REUTERS/Hannah McKay
Britain's Prince Philip, the Duke of Edinburgh, (R), is welcomed by President Nelson Mandela's attorney Ismail Ayob (L) October 29. Prince Philip is in Johannesburg to hand out youth awards devoted to ways to safeguard the world's environment and ecology
Britain's Prince Philip, the Duke of Edinburgh, sips from a glass of Boag beer as he visits the brewery in Launceston March 29. Earliar a tomato was thrown towards Britain's Queen Elizabeth and Prince Philip on Wednesday while they were on a walkabout in the Australian city of Launceston, witnesses said. RUS/DL
His Royal Highness, Prince Philip, Duke of Edinburgh presents the Congressional Award Foundations Leadership Award to former first lady Nancy Reagan (R) during a photo opportunity prior to the foundations dinner at the Beverly Hills Hotel March 15 in Beverly Hills. Mrs. Reagan was honored for her efforts as first lady in the fight against youth drug abuse. The Prince's visit also serves as a launch of the Congressional Award program to students in the Los Angeles school district in an effort to promote community service among the students. FSP
CANADA - CIRCA 1900: Queen Elizabeth and Prince Philip with then Defence Minister James Richardson during the royal visit to Canada last summer. Reader; in letter; complains that Canada has few plans to mark the Queen's 25 years on the throne; arguihg that the crown is a true symbol of unity. (Photo by Doug Griffin/Toronto Star via Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana Waving From The Balcony Of Buckingham Palace. They Are Accompanied By Prince Philip. The Princess Is Wearing A Dress Designed By David And Elizabeth Emanuel. (Photo by Tim Graham/Getty Images)
US President Barack Obama (R) sees off Britain's Queen Elizabeth II (2nd-L), as Prince Philip, the Duke of Edinburgh (L), and First Lady Michelle Obama follow after a reciprocal dinner at the Winfield House in London, on May 25, 2011. Obama and his wife Michelle enjoyed a regal welcome from Queen Elizabeth II, who has met every US president but one since the 1950s. Obama's visit, the second stop on a European tour, comes as Britain seeks to prove its staying power despite fading military might and Washington looks to retool its decades-old alliance with Europe as a catalyst for global action. AFP Photo/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Prince Philip, Duke of Edinburgh. Z10862-001 (Photo by WATFORD/Mirrorpix/Mirrorpix via Getty Images)
LONDON, ENGLAND - MARCH 16: Prince Philip, Duke of Edinburgh departs after officially re-opening the The National Army Museum on March 16, 2017 in London, England. The Museum has undergone a 3 year �23.75 million re-development (Photo by Leon Neal/Getty Images)
Queen Elizabeth II with Prince Philip, the Duke of Edinburgh and Prince Andrew, circa 1980. (Photo by Serge Lemoine/Getty Images)
(Original Caption) Preparing for their state visit to India, Pakistan, Nepal and Iran, Britain's Queen Elizabeth II and her husband Prince Philip, are shown in this photo, taken at Buckingham Palace. The Queen is wearing a pale pink and white embroidered evening gown, the Russian Fringe tiara, and the Sash and Star of the Order of the Garter. On her left shoulder are the Family Orders. Prince Philip is wearing the full dress uniform of an Admiral of the fleet. His decorations include the Sash and Star of the Order of the Garter and the Star of Grand Master of the Order of the British Empire. The Queen and Prince Philip were slated to arrive in New Delhi, January 21st, on the first stop of the Royal tour.
WINDSOR - MAY 11: Prince Philip the Duke of Edinburgh competes in the Carriage Driving event at the Windsor Horse Show on May 11, 1991. (Photo by David Levenson/Getty Images)
WINDSOR - MAY 11: Prince Philip the Duke of Edinburgh competes in the Carriage Driving event at the Windsor Horse Show on May 11, 1991. (Photo by David Levenson/Getty Images)
This official photograph released by Buckingham Palace to mark her 90th birthday shows Britain's Queen Elizabeth with her husband, Prince Philip, and was taken at Windsor Castle, in Windsor, Britain just after Easter 2016. Annie Leibovitz/Handout via Reuters - THIS IMAGE MAY BE USED FREE OF CHARGE, INTERNATIONALLY, FOR 14 DAYS FROM RELEASE, UNTIL FRIDAY, JUNE 24, 2016. AFTER THIS DATE, FOR USE OR REPRODUCTION IN ANY FORMAT ON ANY PLATFORM, PLEASE REFER TO ROYAL COMMUNICATIONS FOR APPROVAL. NO COMMERCIAL OR BOOK SALES. NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY
Britain's Prince Philip leaves after presenting Royal Medals at the Royal Society of Edinburgh, in Edinburgh August 12, 2013. The Prince, making his first public appearance since his hospital admission in June, presented the Royal Medals which are awarded for a range of subjects. REUTERS/Andrew Milligan/Pool (BRITAIN - Tags: ENTERTAINMENT EDUCATION SOCIETY ROYALS TPX IMAGES OF THE DAY)
LONDON, ENGLAND - AUGUST 2: Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, raises his hat as he makes his final individual public engagement as he attends a parade to mark the finale of the 1664 Global Challenge, on the Buckingham Palace Forecourt on August 2, 2017 in London, England. (Photo by Hannah McKay - WPA Pool/Getty Images)
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