Máel Sechnaill mac Domnaill

Máel Sechnaill mac Domnaill (949–1022), called Máel Sechnaill Mór, of Clann Cholmáin, became king of Mide and High King of Ireland in 980. That year he defeated Olaf Cuaran of Dublin at Tara, took the city and freed its slaves.

With Brian Boru he won the Battle of Glenmama in 999, but surrendered the high kingship to Brian in 1002. After Brian fell at Clontarf in 1014, Máel Sechnaill regained the high kingship and ruled until his death.