Saint Colman mac Duagh was born at Corker, Kiltartan Parish, County Galway, Ireland, c. 550AD (died October 29, 632AD), the son of the Irish chieftain Duac (and thus, in Irish, mac Duach). Colman means "little dove". He was educated at Saint Enda's monastery in Inishmore/Árainn, the largest of the Aran Islands. Thereafter he was a recluse, living in prayer and prolonged fastings, first on Inismore, then in a cave at the Burren in County Clare, an area bordering the southern border of county Galway and thus close to what is today the village of Kilmacduagh. With King Guaire Aidne mac Colmáin (d. 663) of Connacht he founded the monastery of Kilmacduagh, ("the church of the son of Duac"), and governed it as abbot-bishop. His associates included Surney of Drumacoo.
Saint Colman Mac Duagh is the patron saint of his cousin, King Guaire and his descendants.
As with many relics, Saint Colman's abbatial crozier has been used through the centuries for the swearing of oaths. Although it was in the custodianship of the O'Heynes of Kiltartan (descendants of King Guaire) and their relatives, the O'Shaughnessys, it can now be seen in the National Museum in Dublin.
He had a pet rooster who woke him for morning prayer, then miraculously trained a mouse to wake him for prayer at night! Then miraculously trained a fly to mark where he'd left off reading in his prayer book!