George followed his father into the Royal Navy, and after passing out from the Royal Naval College at Dartmouth, was promoted to sub-lieutenant on 15 January 1913.[2] He was promoted to lieutenant on 15 February 1914,[3] and served in the First World War. In 1917, his father and several of his relations relinquished their German names, styles and titles in exchange for British peerages at the behest of George V. Accordingly, Prince George dropped the style of Serene Highness and his surname was anglicised to "Mountbatten." When his father was created Marquess of Milford Haven in late 1917, George received the courtesy title of Earl of Medina, succeeding to his father's peerage after his death in September 1921. During the war, George's aunt Empress Alexandra of Russia along with his uncle by marriage Nicholas II of Russia, five cousins and another aunt Elisabeth were killed by communistrevolutionaries.
Lord Milford Haven, as George was now known, remained in the Royal Navy after the war; he was promoted to lieutenant-commander on 15 February 1922[4] and to commander on 31 December 1926.[5] In 1932, he retired from active service at his own request, with effect from 9 December of that year.[6] On 6 November 1937, shortly before his death, he was promoted to the rank of captain on the retired list.[7]
An accomplished mathematician, the Marquess "could work out complicated gunnery problems in his head" and "read books on calculus casually on trains".[8]Queen Elizabeth II, his niece-in-law, considered him "one of the most intelligent and brilliant of people".[9]
1st: Out of a Coronet Or two Horns barry of ten Argent and Gules issuing from each three Linden Leaves Vert and from the outer side of each horn four Branches barwise having three like Leaves pendent therefrom of the last (Hesse); 2nd: Out of a Coronet Or a Plume of four Ostrich Feathers alternately Argent and Sable (Battenberg)
Escutcheon
Quarterly: 1st and 4th, Azure a Lion rampant double-queued barry of ten Argent and Gules armed and langued of the last crowned Or within a Bordure compony of the second and third (Hesse); 2nd and 3rd, Argent two Pallets Sable (Battenberg); charged on the honour point with an Escutcheon of the arms of Princess Alice of the United Kingdom, namely the Royal Arms differenced by a Label of three points Argent the centre point charged with a Rose Gules barbed Vert and each of the other points with an Ermine Spot Sable
Supporters
On either side a Lion double-queued and crowned all Or
Motto
In Honour Bound
Orders
The shield is surrounded by the heraldic circlet of the Royal Victorian Order, which bears the order's motto (VICTORIA), and suspended below the shield is the insignia of a Knight Grand Cross of the order (GCVO)
Ancestry
Ancestors of George Mountbatten, 2nd Marquess of Milford Haven
*Not Mountbatten or Battenberg by birth. Adopted the surname Mountbatten from his maternal line on abandoning his patrilineal Greek and Danish princely titles.