The 1911 Irish Census records a James Templeton and Mary Colville Templeton residing at house 59, Brunswick Road, Bangor with their children (3 daughters and a younger son, James).
James Templeton of 64 Southwell Road, Bangor may have been his father or brother.
Known as Moore, he joined the Belfast Banking Company on 1st April 1930 and served in Head Office.
Soon after the war started, he volunteered and enlisted into the Royal Canadian Air Force (R.C.A.F.) with Service Number 1071533. Having been promoted to Sergeant (W.Op./Air Gunner), he was serving with the 427 (R.C.A.F.) Sqdn. Royal Air Force Volunteer Reserve (R.A.F.V.R.) when he was killed on 4th February 1943.
Templeton flew in a Wellington bomber (III BJ668 ZL-X) out of RAF Croft, Neasham, North Yorkshire, England. His plane crashed at Ploemeur, Brittany, NW of Lorient, France. All but one of the crew were killed. The survivor became a Prisoner of War.
The LostAircraft website records details of the incident here.
He is also remembered on the findagrave website here and on a French site here and on the War Dead of North Down and Ards website.
There is a memorial to Templeton in the Trinity Presbyterian Church, Bangor.