High Quality Content by WIKIPEDIA articles! The Parliament of Northern Ireland was the home rule legislature created under the Government of Ireland Act 1920, which existed from 7 June 1921 to 30 March 1972, when it was suspended. It was subsequently abolished under the Northern Ireland Constitution Act 1973. The third Government or Executive Committee of the Privy Council of Northern Ireland, led by the Prime Minister Terence O'Neill, ruled between 1963 and 1969.