This only son of Prince Andrew of Greece became a British subject in 1947 & gained a dukedom
[DOC] [TLE] Prince Philip, Duke of Edinburgh From... - Sigitas Buivydas | Facebook [PAR] 1947) Issue Charles, Prince of Wales Anne, Princess Royal Prince Andrew, Duke 
... Greek Orthodoxy to Anglicanism, and became a naturalised British subject, ... 
10 June 1921, the only son and fifth and final child of Prince Andrew of Greece ... 
he gained the top grade in four out of five sections of the qualifying examination.