Attorney General
Begins service as Attorney General during the Cumann na nGaedheal administration.
Role range: 1926-1932
Historical biography archive · Updated 2026-11-03
John A. Costello Biography and Timeline
Follow John A. Costello through 6 dated historical records for Ireland.
John A. Costello, historical timeline
A chronological timeline drawn from matching World History Database records.
6Distinct records
1 of 1Page
1926–1955Years on this page
1926
1948
First Inter-Party Government
Becomes Taoiseach of the state's first inter-party government.
Role range: 1948-1951
Republic of Ireland Act
Costello's administration secures enactment of the Republic of Ireland Act, ending the Crown's remaining statutory external role.
Role range: 1948-1951
1949
Republic of Ireland
The Republic of Ireland Act becomes effective under Costello, marking the state's internationally recognized republican status.
Role range: 1948-1951
1954
Second Inter-Party Government
Returns as Taoiseach at the head of a second inter-party government.
Role range: 1954-1957
1955
United Nations Membership
Leads the government when Ireland is admitted to the United Nations.
Role range: 1954-1957
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.