David Mountbatten, 3rd Marquess of Milford Haven

David Michael Mountbatten, 3rd Marquess of Milford Haven (May 12, 1919–April 14, 1970), styled Viscount Alderney before 1921 and Earl of Medina between 1921 and 1938, was the son of the 2nd Marquess of Milford Haven and Nadezhda de Torby.

His paternal grandparents were Prince Louis of Battenberg and Princess Victoria of Hesse and the Rhine. His maternal grandparents were Grand Duke Michael Mikhailovich Romanov and Sophia von Merenberg de Torby. He is also a descendant of the Russian writer Aleksandr Pushkin as well as of Peter the Great's African protégé, Abram Petrovich Gannibal.

He grew up at the family home in Holyport, Berkshire and enjoyed a close friendship with his first cousin Prince Philip of Greece, later the Duke of Edinburgh, and served as best man to the prince at his marriage to The Princess Elizabeth, later Queen Elizabeth II. During the Second World War he served in the Royal Navy and took part in Operation Pedestal.

Lord Milford Haven married:

1) Romaine Dahlgren Pierce (17 July 1923-15 February 1975), daughter of Vinton Ulric Dahlgren Pierce of United States of America and wife Margaret Knickerbocker Clark, on 4 February 1950 at Washington D.C., U.S.A., formerly married on 23 May 1946 to William Simpson. They were divorced in 1954 in Mexico and she married a third time James B. Orthwein. Romaine's great-grandfather was Admirial John A. Dahlgren
2) Janet Mercedes Bryce (born 29 September 1937), daughter of Major Francis Bryce and wife Gladys Jean Mosley (and whose aunt Mary Mercedes Bryce married Joseph Harold John Phillips, the grandparents of Alexandra Hamilton, Duchess of Abercorn and Natalia Grosvenor, Duchess of Westminster), on 17 November 1960 at St. Andrew's Church, Frognal, London. They had two children: