Britain's Queen Elizabeth II is photographed on a visit to the town of Poundbury, southwest England, on October 27, 2016. The Queen and The Duke of Edinburgh, accompanied by The Prince of Wales and The Duchess of Cornwall, visited Poundbury. Poundbury is an experimental new town on the outskirts of Dorchester in southwest England designed with traditional urban principles championed by The Prince of Wales and built on land owned by the Duchy of Cornwall. / AFP PHOTO / POOL / JUSTIN TALLIS

Britain's Queen Elizabeth II tours the garden exhibits at the 2015 Chelsea Flower Show in London on May 18, 2015. The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, will run this year from May 19-23. AFP PHOTO / POOL / STUART WILSON

Pope John Paul II is shown with Queen Elizabeth II at Buckingham Palace, May 29, 1982. The Pope had earlier arrived to commence a six-day visit, the first by a reigning pontiff to Great Britain. (AP PHOTO/POOL)

Her Majesty Queen Elizabeth II of England is shown in the state coach as she leaves Buckingham Palace for the Houses of Parliament in London, England, on Nov. 4, 1952. (AP Photo)

Britain's Princess Elizabeth, later Queen Elizabeth II, on her 21st birthday, seated in Natal National Park, South Africa, April 21, 1947. In the background are the Drakenberg Mountains. (AP Photo/Eddie Worth)

Image ??Licensed to i-Images Picture Agency. 08/09/2015. Edinburgh, Scotland,United Kingdom. Queen Elizabeth II boards a steam train at Edinburgh Waverley Station, Scotland, for the opening of the Scottish Borders new railway line to Tweedbank, on the day she becomes the longest reigning British Monarch in history. Picture by Andrew Parsons / i-Images

??Licensed to i-Images Picture Agency. 05/09/2015. Braemar, Aberdeenshire, United Kingdom. Queen Elizabeth II arrives with the Duke of Edinburgh, Prince of Wales and Peter and Autumn Phillips .Picture by Andrew Parsons / i-Images

Prince George of Cambridge looks away as his mother, Britain's Catherine, Duchess of Cambridge (2nd R) and father, Britain's Prince William, Duke of Cambridge (R) talk to Britain's Queen Elizabeth II (2nd L), Britain's Prince Philip, Duke of Edinburgh (L) and Camilla, The Duchess of Cornwall (3rd L) as they leave Charlotte's Christening at St. Mary Magdalene Church in Sandringham, England, on July 5, 2015. Britain's baby Princess Charlotte was christened on Sunday outside Queen Elizabeth II's country residence on Sunday. AFP PHOTO / POOL / CHRIS JACKSON

Prince George of Cambridge speaks to his great grandmother, Britain's Queen Elizabeth II as they leave Princess Charlotte of Cambridge's Christening at St. Mary Magdalene Church in Sandringham, England, on July 5, 2015. Britain's baby Princess Charlotte was christened on Sunday in her second public outing since her birth nine weeks ago to proud parents Prince William and his wife Kate. The low-key ceremony took place in a church on the country estate of great grandmother Queen Elizabeth II. AFP PHOTO / POOL / CHRIS JACKSON

TOPSHOTS Britain's Queen Elizabeth II waves to the crowd as she walks across the Pariser Platz near Berlin's landmark Brandenburg Gate on June 26, 2015 on her way to leave Berlin. British Queen Elizabeth II ends her three-day visit to Germany. AFP PHOTO / ADAM BERRY

K?nigin Elisabeth II verlasst das Hotel Adlon und wird mit ihrem Bentley durch das Brandenburger Tor gefahren. Berlin 26.06.2015 Koenigin Elisabeth II beendet Besuch in Berlin Queen Elisabeth II leaves the Hotel Adlon and will with her Bentley through the Brandenburg goal Dangers Berlin 26 06 2015 Queen Elisabeth II ended Visit in Berlin

German Chancellor Angela Merkel welcomes Queen Elizabeth II at the Federal Chancellery, in the main courtyard in Berlin. June 24th, 2015. Credit: Timm/face to face fot. Face to Face/REPORTER

Britain's Queen Elizabeth II reacts during a service to mark the 800th anniversary of Magna Carta at Runnymede near Windsor, west of London, on June 15, 2015. Britain's Queen Elizabeth II led commemorations on the meadow in Runnymede, south England, where her distant predecessor King John sealed Magna Carta, the document that laid the foundation for parliamentary democracy in the West, on June 15, 1215. AFP PHOTO / POOL / CHRIS JACKSON

Queen Elizabeth II attends the The Order of the Garter Service at St George's Chapel at Windsor Castle on June 15, 2015 in Windsor, England. Photo: Patrick van Katwijk/DPP/face to face - Germany, Austria, Switzerland, France, Eastern Europe rights only - fot. Face to Face/REPORTER

Britain's Queen Elizabeth II, accompanied by Prince Philip, leaves after attending a service of commemoration to pay tribute to members of the British armed forces past and present who served on operations in Afghanistan, at St Paul's Cathedral, in central London, Friday, March 13, 2015. (AP Photo/Lefteris Pitarakis), APTOPIX

Britain's Queen Elizabeth II, right, speaks with French President Jacques Chirac, left, as British Prime Minister Tony Blair looks on during a meeting before a formal dinner at the G8 summit in Gleneagles, near Auchterarder, Scotland, Wednesday July 6 2005. (AP Photo/Kirsty Wigglesworth,Pool)

Britain's Queen Elizabeth II (L) is greeted by her grandson Prince William during a visit to RAF Valley in Anglesey, Wales on April 1, 2011. Britain's Queen Elizabeth II and Prince Philip, The Duke of Edinburgh today visited RAF Valley in Anglesey and were given a personal tour of an RAF search and rescue helicopter by Prince Willam. AFP PHOTO/ANDREW YATES

Britain's Queen Elizabeth II, right, speaks with German Chancellor Gerhard Schroeder, left, as British Prime Minister Tony Blair looks on during a meeting before a formal dinner at the G8 summit in Gleneagles, near Auchterarder, Scotland, Wednesday July 6 2005. (AP Photo/Kirsty Wigglesworth,Pool)

Britain's Queen Elizabeth II reacts as she is given flowers by children as she leaves after attending the British royal family's traditional Christmas Day church service in Sandringham, England, Saturday, Dec. 25, 2010. (AP Photo/Matt Dunham)

A handout picture released by the Emirati news agency WAM shows Emirati Minister of State Reem al-Hashemi (C-R) and cultural guide Fatima al-Melhi (2nd-L) speaking to Britain's Queen Elizabeth II during her visit to the Sheikh Zayed Grand Mosque in the Emirati capital of Abu Dhabi on November 24, 2010. AFP PHOTO/HO/WAM == RESTRICTED TO EDITORIAL USE ==