The Cenél nEógain or Kinel-Owen ("Kindred of Owen") are a branch of the Northern Uí Néill, any of several dynasties in north-western medieval Ireland.
Originally their power-base was in Inishowen, with their capital at Ailech, in modern-day County Donegal in what is now the west of Ulster.
Under pressure from the Cenél Conaill, they gradually spread their influence eastwards into modern counties Tyrone and Londonderry, pushing aside the Cruithin east of the River Bann, and encroaching on the Airgiallan tribes west of Lough Neagh.
The Clann Aodha Bhuidhe, or Clandeboye O'Neill, is a branch of Clann Néill, descended from Aodh Meth (Hugh the Fat), King of Ulster from 1196 to 1230; Aodh Medh's brother was Niall Ruadh (Red Niall), King of Ulster for a month after his death, and Prince of Tyrone.
[1] (MacNaul, MacNally) Progenitor: Cú Uladh Ó Néill Extra: Descended from Cú Uladh, son of Brian Ballagh Ó Néill, King of Clandeboye who was killed in battle at Carrickfergus in 1425.
The Cenél mBinnigh where the first clan of the Cenél nEóghain to advance from Inishowen, bypassing the fierce resistance of the Ciannachta (northern County Londonderry) and into western Airgialla (modern-day County Tyrone), and in doing so ousted several Airgiallan clans (Ui Tuirtri and FIr Li) to east of the River Bann.
In the 14th century, this clan was forced across the River Foyle by the O'Donnells to northeast and east Strabane.
The end of this rivalry would see the destruction of the MacQuillans power and the weakening of the O'Cahans corresponding to the rise of MacDonnells.
The Scottish clans Both Chanain (Buchanan, Mawhinney) and Mac Ausaláin (MacCausland) both descend from Ausalan Buoy O'Kayn, allegedly of the O'Cahans of the Route.