Their kingdom was known as Tír Conaill, with their powerbase at Mag Ithe in the Finn valley, however they gradually expanded to cover what is now counties Donegal and Fermanagh.
The most famous descendant of the Cenél Conaill is Saint Columba, who founded the monastery at Derry, and is claimed as being the grandson of Conall Gulban.
Gallchobar was the principal descendant of Conall Gulban, allowing the Gallaghers to claim to be the most senior and prestigious branch of the entire Cenél Conaill.
They are listed as kings of Magh Ith, Tír Eanna, and Fanad in present-day County Donegal, a territory around the southern tip of Inishowen.
Tigernach's son Nainnid is mentioned as being at the battle of Móin Daire Lothair (modern-day Moneymore, County Londonderry) where the Northern Uí Néill defeated the Cruithin.