Branches of the Cenél nEógain

The Cenél nEógain or Kinel-Owen ("Kindred of Owen") are a branch of the Northern Uí Néill, who claim descent from Eógan mac Néill, son of Niall of the Nine Hostages. 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. By the 11th century their power-base had moved from Ailech to Tullyhogue outside Cookstown, County Tyrone. By the 12th century the Cenél Conaill conquered Inishowen; however, it mattered little to the Cenél nEóghain as they had established a powerful over-kingdom in the east that had become known as Tír Eoghain, or the "Land of Owen", preserved in the modern-day name of County Tyrone.

At their greatest they held land spanning much of County Tyrone, as well as parts of counties Derry, Donegal, Fermanagh, Monaghan, and Armagh.

Below is a list of their principle clans and septs.