Niall Oge O'Neill
Niall Oge O'Neill 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 — Lord of Upper Clandeboye
- *Shane O'Neill
- *Niall McBrian Fertagh O'Neill — Lord of Upper Clandeboye
- **Conn O'Neill — Lord of Upper Clandeboye
- ***Daniel O'Neill — Colonel in the Army of Charles I & Charles II
- ***Conn Oge O'Neill — Colonel in Irish Confederate Army
- **Aodh Meirgeach O'Neill
- **Tuathal O'Neill
- ***Phelim McToole O'Neill — 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 — The Annals of the Four Masters regarded him as King of Clandeboye
- *Eoghan O'Neill
- **Brian Modortha O'Neill
- Phelim Dubh O'Neill
- Sir Conn O'Neill
- *Domhnall O'Neill