Niall Oge O'Neill (Irish: Niall Óg Ó Néill) was a lord of Clandeboye in medieval Ireland. A son of Niall Mór O'Neill, he succeeded his brother, Phelim Bacagh O'Neill, to the lordship of Clandeboye after his death in 1533. He reigned until his own death in 1537, after which he was succeeded by his brother Murtagh Dulenach O'Neill. O'Neill's nickname "Óg" meant "young". Issue Brian Faghartach O'Neill (died 1548) — Lord of Upper Clandeboye Shane O'Neill Niall McBrian Fertagh O'Neill (died 5 February 1601) — Lord of Upper Clandeboye Conn O'Neill (died 1619) — Lord of Upper Clandeboye Daniel O'Neill (1612 – 24 October 1664) — Colonel in the Army of Charles I & Charles II Conn Oge O'Neill (died 13 June 1643) — Colonel in Irish Confederate Army Aodh Meirgeach O'Neill Tuathal O'Neill Phelim McToole O'Neill (died 22 June 1650) — Colonel in Irish Confederate Army, killed at Battle of Scarrifholis Henry McToole O'Neill Owen O'Neill — Captain in Army of James II Aodh O'Neill (died 1555) — The Annals of the Four Masters regarded him as King of Clandeboye Eoghan O'Neill (died 5 May 1601) Brian Modortha O'Neill Phelim Dubh O'Neill Sir Conn O'Neill (died Jan 1589) Domhnall O'Neill (died 1584) References External links The Peerage Clandeboye 16th-century Irish people O'Neill dynasty