King Charles III, is the first child of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. He was just 3 years old when he became the heir apparent as his mother acceded to the throne as queen, following the death of her father, King George VI. <br><br> Prince Charles ahead of delivering his Easter message at Clarence House in London, March 15, 2018.

Britain's Queen Elizabeth II, then Princess Elizabeth, with her husband Prince Philip, the Duke of Edinburgh, and their children Prince Charles and Princess Anne at Clarence House, in Aug. 1951.

Prince Charles sits with his sister, Princess Anne at Balmoral Castle in Scotland, Nov. 14, 1952.

Queen Elizabeth II in uniform as colonel chief of the Grenadier Guards, with Prince Charles, Princess Anne and Prince Philip, the Duke of Edinburgh, waving from the balcony of Buckingham Palace, in London, June, 1953.

Britain's Queen Elizabeth II and her son Prince Charles, at Windsor Castle, May 15, 1969.

Prince Charles, the Prince of Wales, son of Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, heir to the British throne, seen here in his room at Trinity College when he was an undergraduate, April 1, 1969.

Queen Elizabeth II puts a crown on her son Prince Charles during his investiture as Prince of Wales, at Caernarvon Castle in Wales, July 1, 1969.

Charles, Prince of Wales wearing a flying kit during a visit to RAF Wittering, July 13, 1977.

Charles, Prince of Wales windsurfing, November 1979.

Picture of Lady Diana, Princess of Wales, with Prince Charles of Wales at their wedding at St Paul Cathedral in London, in this file photo dated July 29, 1981.

New born Prince William with Diana, Princess of Wales and Prince Charles leave St. Mary's hospital on June 22, 1982 in Paddington, London.

Prince Charles and Princess Diana pose for photographers with the newborn Prince Harry outside the Lindo Wing in London, Sept. 16, 1984.

President Ronald Reagan and his wife Nancy welcome Prince Charles and his new bride, Princess Diana to the White House, Washington, D.C., Nov. 9, 1985.

The Prince of Wales with Prince William and Prince Harry outside Westminster Abbey at the funeral of Diana, The Princess of Wales, on Sept. 6, 1997.

Prince Philip, the Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and Prince Charles, Prince of Wales, walk outside Westminster Abbey during the funeral service for Diana, Princess of Wales, Sept. 6, 1997.

Prince Charles, and Camilla leave the Service of Prayer and Dedication blessing their marriage at Windsor Castle in Berkshire, England, on April 9, 2005.

Prince Charles of Wales shares a laugh with the Dalai Lama at Clarence House on June 20, 2012, in London, England. The exiled Buddhist Tibetan leader is taking part in a week-long tour of the United Kingdom.

Camilla, Duchess of Cornwall, and Prince Charles, Prince of Wales, pose outside the Akshardham Temple during a visit to Delhi, India, on Nov. 8, 2013.

Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall, attend the Royal Ascot at Ascot Racecourse in England on June 18, 2014.

Prince Charles, Prince of Wales, Prince William, Duke of Cambridge and Prince George of Cambridge watch the annual Trooping The Colour ceremony at Buckingham Palace, June 13, 2015, in London.

The royal family, including Queen Elizabeth II and Meghan, Duchess of Sussex, watch the flypast on the balcony of Buckingham Palace during Trooping The Colour, in London, on June 9, 2018.

Queen Elizabeth and Prince Charles, the Prince of Wales attend the State Opening of Parliament in London, Oct. 14, 2019.

Prince Charles, Prince of Wales, makes a speech at Mansion House in London on March 12, 2020.

Queen Elizabeth II and Prince Charles, Prince of Wales, plant a tree to mark the start of the official planting season for the Queen's Green Canopy, Oct. 1, 2021, near Crathie, Scotland.

King Charles III and members of the royal family follow the coffin of Queen Elizabeth II as it is carried out of Westminster Abbey after her State Funeral, Sept. 19, 2022.