Cormac of Cashel

Cormac of Cashel (Cormac mac Cuilennáin) was born in 831 and was bishop and king of Munster from 902 until his death on 13 September 908, when he was killed in Leinster at the battle of Bellaghmoon. He is thought to have been the first bishop of Cashel.

After his death he was regarded as a saint, and miracles were said to occur at his shrine at Castledermot in County Kildare. He was reputed to be a man of great learning; he is credited with the Sanas Cormaic (Cormac's Glossary), the Rule of Cormac, which stressed humility, spiritual discipline and the study of Scripture, and the Psalter of Cashel, now lost. Some of the traditions about him are doubtful. He is a saint of the undivided Church, venerated in the West.

His commemoration falls on 14 September (new calendar); the Churches on the Old Calendar keep the same day of the Menaion on 27 September of the civil calendar.