Jago was born on 21 July 1925 in
Camelford, Cornwall, the son of Thomas Bennett Jago, who managed the local Barclays bank, and his mother Violet. He went to
Camelford Grammar School before studying history at
Christ Church, Oxford. Jago served as a lieutenant on the destroyer
HMS Wolfhound in the North Atlantic during
World War II. After the war he returned to Oxford and completed his degree. In 1952, Jago married Penelope Vaughan-Morgan (1926-2018), a granddaughter of
Kenyon Vaughan-Morgan, and niece of
John Vaughan-Morgan, Baron Reigate. ==References==