Costello, John Aloysius (1891–1976)

Irish Fine Gael politician; Taoiseach (prime minister) 1948–51 and 1954–57. Costello was born in Dublin and educated at University College, Dublin. As attorney general to the Irish Free State 1926–32, he assisted in the drafting of the 1931 Statute of Westminster, which regularized relations between the British government and the dominions. In 1949 he oversaw the withdrawal of Eire from the Commonwealth and the formal declaration of the Republic of Ireland.

Costello was elected to the Dáil (parliament) in 1933 and, untainted by a civil war background, he was the compromise candidate for Taoiseach (prime minister) in the formation of the first interparty government in 1948. He caused surprise by declaring Ireland a republic and leaving the Commonwealth in 1949. His handling of the ‘Mother and Child’ health care controversy of 1950–51 seemed to demonstrate the continuing domination of Irish life by the Roman Catholic Church; spiritual leaders expressed concern that the planned care might offer instruction on moral issues, and argued that the right to provide for the health of children belonged to the parents and not the state. Costello's second term of office was ended by the IRA's ‘border campaign’, which caused the break-up of his coalition. He retired to the backbenches and resumed his legal practice.