Saturday. 1st April. St Ceallach (Celsus) was born in 1080. He became Abbot of Armagh in 1105 and was ordained priest. He was influenced by the reform then in progress in Munster. He presided at the Synod of Rathbreasail in 1111. In 1129, on a visitation of Munster, he died and was buried in Lismore in accordance with his own request.