Flannán mac Toirrdelbaig was an Irish

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 saint

Saint

A saint is a holy person. In various religions, saints are people who are believed to have exceptional holiness.In Christian usage, "saint" refers to any believer who is "in Christ", and in whom Christ dwells, whether in heaven or in earth...

 who lived in the 7th century and was the son of a king of Thomond

Thomond

Thomond The region of Ireland associated with the name Thomond is County Clare, County Limerick and north County Tipperary; effectively most of north Munster. The name is used by a variety of establishments and organisations located in , or associated with the region...

. He entered Mo Lua's monastery at Killaloe

Killaloe, County Clare

Killaloe is a large village in east County Clare, Ireland, situated in the midwest of Ireland. The village is on the south end of Lough Derg, while the settlement spreads across the River Shannon, with the County Tipperary side known as Ballina...

and seems to have become abbot there. He is remembered as a great preacher.

Son of an Irish chieftain, Turlough he made a pilgrimage to Rome where Pope John IV consecrated him. On his return he became first bishop of Killaloe and also preached in the Hebrides. His feast day is December 18.^{http://www.catholic.org/saints/saint.php?saint_id=640}