Máel Sechnaill mac Máele Ruanaid

Máel Sechnaill I (died 27 November 862) of Clann Cholmáin became king of Mide in 845 and king of Tara in 846. Late in 845 he captured the Viking leader Turgesius and drowned him in Lough Owel.

Acknowledged as high king by the Ulstermen, he took Munster hostages in repeated campaigns and in 859 detached Osraige from Munster. In 860 he marched against his northern rival Áed Findliath and beat off a night attack. His son Flann Sinna held the high kingship.