Gambon was born in Dublin during World War II. His father, Edward Gambon, was an engineer and his mother, Mary (née Hoare), was a seamstress. His father decided to seek work in the rebuilding of London, and so the family moved to Mornington Crescent in north London, when Gambon was five. His father had him made a British citizen — a decision that would later allow Michael to receive an actual, rather than honorary, knighthood and CBE. (although, under the British Nationality Act 1981 anyone born in Ireland before 1949 can still register as a British subject and, after five years' UK residence, as a British citizen).