A convert, he was baptized by and became a spiritual student of Saint Colman. Monk. Trained as an evangelist by Saint Diomma of Kildimo. Worked in Ireland before the arrival of Saint Patrick. Pilgrim to Rome, Italy. First bishop of Ardmore, Waterford, Ireland. Known as a miracle worker.
- Book of Saints, by the Monks of Ramsgate
- Britannia Sancta
- Catholic Online
- Life of Saint Declan of Ardmore
- Our Sunday Visitor’s Encyclopedia of Saints