Duke of Edinburgh and husband of Queen Elizabeth II . He earned the distinction of being the longest-serving and oldest spouse of a reigning British monarch.
He joined the Royal Navy when he was eighteen years old. That same year, he began corresponding with his third cousin, thirteen-year-old Princess Elizabeth.
As Chairman of the Coronation Commission, he was the first member of the royal family to fly in a helicopter.
His son, Prince Charles , became the heir to the British throne.