Northern Uí Neill
Ulster Series
http://www.rootsweb.ancestry.com/~irlkik/ihm/uineill.htm
The sons of Niall of the Nine Hostages, Eoghan, Conall [Gulban], and Enda, travelled north from the kingdom of Connacht into the western and northern regions of the kingdom of Ulster (county Donegal). It was here in the 5th century that the Cenél Eóghain and Cenél Conaill began to establish themselves as overlords in northwestern Ulster. The Cenél Eóghain established their power base at Inishowen and their capital at Aileach. The Cenél Conaill centered themselves around the rich area of Magh Ithe, in the valley of the river Finn. The two clans alternated as kings of the North up to the 8th century. The Northern Ui Neill also alternated with their southern cousins as so-called ‘sovereigns of Ireland’ into the 10th century.
http://en.wikipedia.org/wiki/Niall_of_the_Nine_Hostages
http://www.larkinclan.eu/niall.htm
https://www.tumblr.com/search/niall+of+the+nine+hostages
http://www.myheritage.com/dna-surname-project/Cineal_Eoghan
http://www.phoenixhollo.com/fr/Eoghan_mac_N%C3%A9ill_0.html