of affairs, in effect since 966, whereby the supreme head of the Irish Church had been a layman. Following the Synod of Ráith Bressail, in which a diocesan structure for Ireland was established, he became the first metropolitan primate of all Ireland.

Early life and background

Cellach was the son of Áed mac Máele Ísu meic Amalgada of the Clann Sínnaig.