Biographical History
Born in Dublin on 20th June 1891 to John Costello and Rose Callaghan, Costello was educated in O'Connell Schools, Richmond Street by the Christian Brothers. At University College Dublin he studied history, languages and literature, obtaining his BA degree in 1911. He obtained his LLB degree in 1914, was called to the inner bar in 1925, and elected a Senior Bencher of the Honourable Society of Kings Inns in 1926. On 31st July 1919 Costello married Ida Mary O'Malley and they had five children, three sons, Wilfred, Declan and John, and two daughters, Grace and Eavan. In 1922 Costello was appointed as Assistant to the Law Officer of the Provisional Government and between 1922 and 1926 was Assistant to the first Attorney-General of the Free State, Hugh Kennedy and Kennedy's successor John O'Byrne.
In 1926 Costello was appointed Attorney-General, a position he held until 1932. First elected to Dáil Éireann in 1933 for the constituency of County Dublin, he subsequently sat for Dublin Townships and later represented the Dublin South-East constituency. On 27th February 1948 Costello was appointed Taoiseach of an Inter-Party Government, the first of its kind in the Irish State, made up of Fine Gael, Labour, Clann na Talmhan, Clann na Poblachta, National Labour and Independents. The coalition remained in power from 1948 to 1951 and is best remembered for the Repeal of the External Relations Act and the formal declaration of the Republic on Easter Monday 1949. Following defeat in the general election of 1951, Costello was asked again, in 1954, to lead the second Inter-Party Government. This second coalition government remained in power until 1957.
In 1959, following General Richard Mulcahy's resignation as leader of the Fine Gael Party, Costello decided not to offer himself as leader and retired to the backbenches. In addition to serving the needs of his constituents Costello continued to practise at the Bar until a short time before his death on 5th January 1976. He was conferred with honorary degrees from Canadian and American universities, elected a member of the Royal Irish Academy in 1948 and made a freeman of Dublin City, along with Eamon de Valera, in March 1975.
Archival History
This collection was depsoited in UCD Archives in Spetember 2002 by his children Declan, John and Evan.