Niall Noígíallach

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The 7th Great Grandson of Conn & Eithne Tháebfhota "of the Long Side", herself one of the daughters of King Cathaír Mór. Eithne is described as the queen of two kings of different generations. 

My line reports the couple had 4 children. Art mac Cuinn (First Known Surname Usage) who married Achtan who bore Cormac mac Airt. Connla who rain off with a fairy woman,

Sadb ingen Chuinn who married first Macnia mac Lugdach and bore their son Lugaid mac Con. She remarried after his death, secondly Ailill Aulom and bore their son Éogan Mór.

Cormac mac Airt and Eithne Ollamda who bore Cairbre Lifechair who with Aine, the daughter of Fionn mac Cumhaill. They bore Fíacha Sroiptine and Eochaid Doimlén.

Muiredach Tirech was born of Fíacha Sroiptine with Eochaid seeding Colla Uais, Colla Fo Chrí & Colla Menn. He formed Airgíalla a medieval Irish over-kingdom and the collective name for the confederation of tribes that formed it. The confederation consisted of nine minor kingdoms, all independent of each other but paying nominal suzerainty to an overking, usually from the most powerful dynasty. Airgíalla at its peak roughly matched the modern dioceses of Armagh and Clogher, spanning parts of counties Armagh, Monaghan, Louth, Fermanagh, Tyrone and Londonderry. The main towns were Armagh and Clogher. The name's usage survives as a cultural area of folk tradition in South East Ulster and adjoining areas of County Louth.

Eochaid Mugmedón is a son of Muiredach Tirech who is known to have children by his mistress code named Mongfind who bore Brión, Fiachrae and Ailill. Then his partner Cairenn bore him Niall and Fergus.

Beginning with Donough O'Quin of Killmallock, Limerick, Ireland, 123rd within the Lords of Thomond Pedigree is where I start to match the known maiden names of all the earls of Dunraven, Mount Earl's wives of which I am a genetic atDNA match.