This only son of Prince Andrew of Greece became a British subject in 1947 & gained a dukedom
[DOC] [TLE] Prince Philip, Duke of Edinburgh [PAR] He has gained something of a reputation for making "off the cuff" often ... His 
father was Prince Andrew of Greece and Denmark, the son of King George I of ... 
On 20 November 1947, Prince Philip married the heiress presumptive to the 
British throne, The ... to the Hellenic Crown, and to become a naturalised British 
subject 1.