O'Neill dynasty

O'Neill Ó Néill
Parent house	Cenél nEógain
Founded	Late 10th century
Founder	Flaithbertach Ua Néill
Current head	By sept Chief
Final ruler	Hugh O'Neill, Earl of Tyrone
Titles	High Kings of Ireland Kings of Tara Kings of Ulster Kings of Ailech Kings of Tyrone Sept titles: O'Neill Mór O'Neill of Tyrone O'Neill of Clandeboye O'Neill of the Fews International titles: Dux Hibernicorum King of Ulster Prince of Tyrone Prince of Clanaboy Prince of the Fews Earl of Tyrone Count of Tyrone Marquis del Norte[1] Viscount O'Neill Viscount of Santa Mónica Marquis de la Granja Baron Dungannon Baron O'Neill of Shane's Castle Baron Rathcavan Baroness O'Neill of Bengarve Baron O'Neill of Clackmannan Baron O'Neill of Gatley O'Neill baronets

The O'Neill dynasty (Irish: Ó Néill) are a lineage of Irish Gaelic origin that held prominent positions and titles in Ireland and elsewhere. As kings of Cenél nEógain, they were historically one of the most prominent family of the Northern Uí Néill, along with the O'Donnell dynasty. Some O'Neills state that their ancestors were kings of Ailech during the Early Middle Ages, as descendants of Niall of the Nine Hostages.

Two of their progenitors were High Kings of Ireland: Niall Glúndub (from whom they take their name) and Domnall ua Néill. From 1232 until 1616, the O'Neills were sovereign kings of Tír Eógain, holding territories in the north of Ireland in the province of Ulster, particularly around modern County Tyrone, County Londonderry and County Antrim, in what is now Northern Ireland. After their territory was merged with the Kingdom of Ireland and the land was caught up in the Plantation of Ulster, they were involved in a number of events, such as Tyrone's Rebellion, the Flight of the Earls, the Irish Rebellion of 1641 and the Irish Confederate Wars.