Echthighern mac Cennétig

Echthighern mac Cennétig, also spelled Echthigern, was a son of Cennétig mac Lorcáin and brother of Mathgamain and Brian Boru of the Dál gCais dynasty, in early medieval Ireland.
The historian Geoffrey Keating states that during the twelve-year period that Mathgamain held the sovereignty of Munster, "Echthighearn, son of Cinneide, was chief of Thomond." Donnchuan mac Cenniedi and his brother Echthigern were slain in the year 950 when Congalach Cnogba, King of Ireland, invaded the province of Munster.