The Rt. Hon. PC, GCB, GCMG (County Roscommon Ireland, Constantinople, Turkey) He was a British diplomat. At his death, Sir Nicholas was the British Ambassador to Turkey. O'Conor, the youngest of three sons was born in Dundermott, County Roscommon in 1843, and was educated at Stoneyhurst College. He entered the diplomatic service in 1866. In his early years, he was attached to the Embassy in Berlin, achieving the rank of Third Secretary in 1870. He served as Secretary at the Hague, Madrid. Rio de Janeiro, and Paris. He was Secretary and Chargé d'Affaires at Peking and Washington, Political Agent and Consul-General in Bulgaria.
Head of Mission O'Conor's first ministerial appointment was at the was British Legation at Peking. 1892: In Seoul, O'Conor was the British Minister to the Empire of Korea. 1895: In St. Petersburg, he the Ambassador of His Britannic Majesty in the Imperial court of the Russian Czar. 1898: In Constantinople, he was Ambassador to the Court of the Sublime Porte of the Ottoman Empire. In 1896 O'Conor was made a Privy Counsellor The youngest of three sons was born in Dundermott, County Roscommon in 1843, and was educated at Stoneyhurst College.