Liam Cosgrave ( born 13 April 1920 ) is a former Irish Fine Gael politician who served as Taoiseach ( 1973 -- 77 ) and as Leader of Fine Gael ( 1965 -- 77 ) .
Liam Cosgrave ( born 13 April 1920 ) is an Irish politician . Cosgrave served as Prime Minister of Ireland ( 1973 -- 77 ) and as Leader of Fine Gael ( 1965 -- 77 ) .