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Colman was a native of the west of Ireland and had received his education on Iona. He was probably a nobleman of Canmaicne. Colman succeeded Aidan and Finan as bishop of Lindisfarne, being appointed in 661. Colman resigned the Bishopric of Lindisfarne after the Synod of Whitby called by King Oswiu of Northumbria decided to calculate Easter using the method of the First Ecumenical Council instead of his preferred Celtic method. The change to the Roman Method led Colmán to leave and travel back to Scotland and eventually, back to Iona.