They belonged to Clann Cholmáin, a kin group descended from Colmán Már, son of Diarmait mac Cerbaill, and were counted among the southern branches of the Uí Néill.
In the 7th century, the dominant kin group among the southern Uí Néill, who shared the title of High King of Ireland or King of Tara with the northern Cenél Conaill kindred, were the rival Síl nÁedo Sláine, whose lands lay in modern County Dublin and County Meath, to the east of Uisnech.
His brother Bodbchad was killed in the Battle of Claenath in 704, near Clane in modern County Kildare, fighting alongside Fogartach mac Néill against the King of Leinster, Cellach Cualann.
[5] In 714 the annals record the Battle of Bile Tened between Clann Cholmáin, led by Murchad, and the Síl nÁedo Sláine near Moynalty.
[8] Shortly afterwards the chief of Síl nÁedo Sláine, Fogartach mac Néill, was "expelled from the kingship and went to Britain".