Charles III, born in 1948 is King of the United Kingdom of Great Britain and Northern Ireland and of the fourteen other Commonwealth realms.

Eldest son of Queen Elizabeth II and her husband Philip of Edinburgh, he belongs to the House of Windsor, which kept that denomination by royal decree even after his mother's marriage. He is the first British monarch to be descended from Queen Victoria through two lines of succession: on his mother's side, through Edward VII, George V and George VI, and on his father's side, through his grandmother Princess Alice of Battenberg, the Queen's great-grandson Victory.

He had two marriages: with Diana Spencer (1981), from whom he divorced in 1996, and with Camilla Shand (2005). He was Duke of Cornwall and Duke of Rothesay from 1952 and Duke of Edinburgh from 2021 until his accession to the throne in 2022.

He held the title of Prince of Wales from July 1958 until his accession to the throne on 8 September 2022, at the mother's death. He was heir to the British throne from 6 February 1952 to 8 September 2022, making him the longest-serving heir to the throne in the history of the British Isles, having surpassed King Edward VII, who was Queen Victoria's heir to the throne from 1841 to 1901. He is also the oldest Sovereign of the United Kingdom ever at the time of taking office (73 years old), having surpassed King William IV. His coronation and that of his wife Camilla were held on May 6, 2023 in Westminster Abbey.