He was the father of Óenucán mac Écertaig (d. 949) and Dúnadach mac Écertaig (d. 955), both of whom became Bishop of Clonmacnoise.
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The union of the sees of Ardagh and Clonmacnoise, which had been proposed in 1709, was carried into effect following the death of Stephen MacEgan, Bishop of Meath on 30 May 1756, who had been administering the see of Clonmacnoise.
He held a synod at Galway in 1523, attended by bishops of Kilmacduagh, Achonry Clonmacnoise, Kilfenora, Ross, in addition to representatives of the dioceses of Elphin, Killala and Armagh.