King’s Official Birthday is celebrated as a public holiday in various Commonwealth realms and British Overseas Territories, including Anguilla, Gibraltar, Montserrat, the Cayman Islands, and the Turks and Caicos Islands, as well as Norfolk Island. This observance occurs on June 15, with most overseas territories celebrating it on the third Monday in June. The holiday commemorates King Charles III, whose actual birthday is November 14, but the official celebration is typically held in June, a tradition established by King Edward VII to ensure better weather. The King's Official Birthday has been celebrated in the UK since 1748, originally on the monarch's birth date. Celebrations in the British Overseas Territories often align with those on Norfolk Island, where the holiday is observed on the Monday following the second Saturday in June.