Muiredach Tirech son of Fiacha Sraibhtine, was a semi-legendary

High King of Ireland High King of Ireland ( ga, Ardrí na hÉireann ) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and later sometimes assigned ana ...

of the fourth century. He gained power by exiling the

three Collas The Three Collas (Modern Irish: Trí Cholla) were, according to medieval Irish legend and historical tradition, the fourth-century sons of Eochaid Doimlén, son of Cairbre Lifechair. Their names were: Cairell Colla Uais; Muiredach Colla Fo Chrí ( ...

, who had killed his father. The Collas later returned and tried to provoke him into trying to kill them. When he did not, they entered his service and led his armies. He was overthrown by Cáelbad. “In the beginning of the fourth century, Muiredeach Tireach, High King of Ireland, directed his nephews, the three Collas, to face north and win sword land for themselves. On the ruins of the old kingdom of Uladh they founded a new kingdom—of

Airgíalla Airgíalla (Modern Irish: Oirialla, English: Oriel, Latin: ''Ergallia'') was 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 independe ...

—which was henceforth for nearly a thousand years to play an important part in the history of

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

, and which was possessed afterwards by their descendants, the MacMahons, O'Hanlons, O'Carrolls, and Maguires.” According to the ''

Lebor Gabála Érenn ''Lebor Gabála Érenn'' (literally "The Book of the Taking of Ireland"), known in English as ''The Book of Invasions'', is a collection of poems and prose narratives in the Irish language intended to be a history of Ireland and the Irish fro ...

''R. A. Stewart MacAlister (ed. & trans.), ''

'' Part V, Irish Texts Society, 1956, p. 345-347 and its derivative works Muiredach Tírech was the father of

Eochaid Mugmedón Eochaid Mugmedón () was a semi-legendary Irish king. According to medieval Irish legend and historical tradition, Eochaid was a High King of Ireland, best known as the father of Niall of the Nine Hostages and ancestor of the Uí Néill and Co ...

, and therefore grandfather of

Niall of the Nine Hostages Niall ''Noígíallach'' (; Old Irish "having nine hostages"), or Niall of the Nine Hostages, was a legendary, semi-historical Irish king who was the ancestor of the Uí Néill dynasties that dominated Ireland from the 6th to the 10th centuries. ...

and ancestor of the

Uí Néill The Uí Néill (Irish pronunciation: ; meaning "descendants of Niall") are Irish dynasties who claim descent from Niall Noígíallach (Niall of the Nine Hostages), a historical King of Tara who died c. 405. They are generally divided into the ...

and

Connachta The Connachta are a group of medieval Irish dynasties who claimed descent from the legendary High King Conn Cétchathach (Conn of the Hundred Battles). The modern western province of Connacht (Irish ''Cúige Chonnacht'', province, literally "f ...

dynasties.

References

Legendary High Kings of Ireland 4th-century Irish monarchs 4th-century Irish people {{Ireland-royal-stub