Prince Henry of the United Kingdom, Duke of Gloucester

The Prince Henry, Duke of Gloucester (Henry William Frederick Albert; 31 March 1900 -- 10 June 1974) was a member of the British Royal Family, the third son of George V of the United Kingdom and Queen Mary, and thus uncle to Elizabeth II. He was appointed potential regent for his niece, when his brother (George VI) came to the throne in 1936, and was required to stay in the United Kingdom until she came of age in case her father died and she ascended the throne as a minor.

The Duke served as the 11th Governor-General of Australia, from 1945 to 1947. At his death, he was the last surviving knight of the Order of St. Patrick.