Conor Myles John O'Brien, 18th Baron Inchiquin

Conor Myles John O'Brien, 18th Baron Inchiquin (17 July 1943 – 3 June 2023), The O’Brien (Chief of the Name), Prince of Thomond, and 10th Baronet of Leamaneh, was an English-born Irish clan chief and holder of an Irish peerage. Although his family's ancestral home, Dromoland Castle, was sold, he remained owner of a large house and substantial estate in Dromoland, County Clare until his death.

Early life and education O'Brien was the son of Hon Fionn Myles Maryons O'Brien (28 October 1903 – 2 August 1977) and Josephine Reine O'Brien Bembaron (circa 1913 - 27 October 2011). He had a sister.

Career O'Brien was commissioned into the 14th/20th Kings Hussars of the British Army in 1963. He served as a troop commander in Benghazi, Tripoli, Cyprus on Operation Tosca, Tidworth, Paderborn (as assistant adjutant), Singapore, and Tidworth as adjutant of the regiment. He became Aide-de-Camp to Commander British Forces Gulf in Bahrain and left the army in 1975, retiring with the rank of Captain.

In 2012, in a long-running dispute with the management of Dromoland Castle, O'Brien was refused an initial application to the High Court for them to immediately return 37 paintings that were loaned several decades prior (after discovering the hotel had allowed damage to occur to many of the paintings, O’Brien requested their prompt return). The hotel, however, scanned and reprinted all the paintings before O’Brien could get them returned and the copies now hang on the walls of Dromoland.

Other work In 1998, O'Brien visited Antioch, California for St. Patrick's Day and Antioch's first St. Patrick's Day Crinniu, hosted by then-Councilman Allen Payton and the city's council proclaimed "Sir Conor O'Brien Day". thumb

Conor O’Brien formed the O’Brien clan foundation, which claims to connect over 800,000 O’Briens worldwide. He also was at one point the chairman of the Standing Council of Irish Chief and Chieftains.

Marriage and children O'Brien married Helen O'Farrell in 1988. They had two daughters, Slaney Alexandra Anne O'Brien (1989) and Lucia Josephine O'Brien (1991). He was succeeded in the barony by his first cousin, Conor O'Brien, 19th Baron Inchiquin.