   terence marne o'neill, baron o'neill of the maine, pc (10 september 1914 â 12 june 1990) was the fourth prime minister of northern ireland and leader (1963â1970) of the ulster unionist party (uup). a moderate who sought to reconcile the sectarian divisions in northern ireland society, he was member of the parliament of northern ireland for the bannside constituency from 1946 until his forced resignation in 1970 as communal conflict erupted; his successor in parliament was ian paisley, while control of the uup passed to harder-line elements. ==background== terence o'neill was born on 10 september 1914 at 29 ennismore gardens, hyde park, london.oxford dictionary of national biography he was the youngest son of lady annabel hungerford crewe-milnes (daughter of the marquess of crewe) and captain arthur o'neill of shane's castle, randalstown, the first mp to be killed in combat during world war i. the family assumed the surname o'neill by royal license in lieu of their original name chichester. the chichesters trace their lineage to the name o'neill through mary chichester, daughter of henry o'neill of shane's castle. terence o'neill grew up in london a
1914_births 1990_deaths Anglicans_from_Northern_Ireland British_Army_personnel_of_World_War_II Chichester_family Graduates_of_the_Royal_Military_College,_Sandhurst High_Sheriffs_of_Antrim Irish_Guards_officers Leaders_of_the_Ulster_Unionist_Party Life_peers Members_of_the_Parliament_of_Northern_Ireland_1945a49 Members_of_the_Parliament_of_Northern_Ireland_1949a53 Members_of_the_Parliament_of_Northern_Ireland_1953a58 Members_of_the_Parliament_of_Northern_Ireland_1958a62 Members_of_the_Parliament_of_Northern_Ireland_1962a65 Members_of_the_Parliament_of_Northern_Ireland_1965a69 Members_of_the_Parliament_of_Northern_Ireland_1969a73 Members_of_the_Privy_Council_of_Northern_Ireland Northern_Ireland_Cabinet_ministers_(Parliament_of_Northern_Ireland) Northern_Ireland_junior_government_ministers_(Parliament_of_Northern_Ireland) People_educated_at_Eton_College People_educated_at_West_Downs_School People_from_County_Antrim People_of_The_Troubles_(Northern_Ireland) Prime_Ministers_of_Northern_Ireland