Columba of Terryglass (Colum) (died 13 December 552) was the son of Ninnidh,[1] a descendant of Crinthainn, King of Leinster.
[3] In his youth, he learned his psalms and hymns from an old holy man named Colman Cule, who lived near Clonenagh, and founded the church of Cluain Cain.
Returning home, he remained a year at Clonenagh before crossing Slieve Bloom and founding a church near Lough Derg.
John Healy reports that around 520 Columba was prompted by an angel to relocate to Inis Cealtra, where he remained a long time.
[4][5] Fintan of Clonenagh received his religious formation at Terryglass and was deeply influenced by the penitential practices and the severity of the Rule.