On 9 April 2021, Prince Philip, Duke of Edinburgh, the husband of Queen Elizabeth II of the United Kingdom and the other Commonwealth realms, and the longest-serving royal consort in history, died of old age at Windsor Castle at the age of 99.
It set in motion Operation Forth Bridge, a plan detailing procedures including the dissemination of information, national mourning, and his funeral. Philip had indicated wishes for a smaller funeral, although amendments were still made to the plan to bring his service in line with COVID-19 regulations, including quarantine for members of his family travelling from abroad. His funeral took place on 17 April 2021.