Cenél Loairn in the context of "Cenél nGabráin"

The Cenél nÓengusa were a kin group who ruled the island of Islay, and perhaps nearby Colonsay, off the western coast of Scotland in the early Middle Ages.

The Senchus fer n-Alban, a census and genealogy of the kingdom of Dál Riata, lists the Cenél nÓengusa as one of the three kin groups making up the kingdom in Argyll. The others were the Cenél nGabráin of Kintyre and the Cenél Loairn of Lorn. A fourth group, the Cenél Comgaill, of Cowal and the Isle of Bute, later split from the Cenél nGabráin. The Senchus portrays Dál Riata as it existed in the mid-seventh century.

Loarn mac Eirc was a possible king of Dál Riata who may have lived in the 5th century. He was buried on Iona. Loarn's main significance is as the eponymous ancestor of Cenél Loairn, a kindred whose name is preserved in Lorne.

The Duan Albanach and the Senchus Fer n-Alban and other genealogies name Loarn's father as Erc son of Eochaid Muinremuir. Loarn appears in Irish traditions as 'King of Alba' in the eighth- to twelfth-century tale "Of The Miracles of Cairnech Here" in the Lebhor Bretnach, the Irish version of the Historia Brittonum, and in the tenth- to twelfth-century tale Aided Muirchertach mac Erca. In these tales, mac Erca spends time with Loarn, his grandfather, before murdering him by setting him aflame.