Saint Iserninus is thought to have been a Briton or Irishman, and is associated with the lands of the Uí Cheinnselaig in Leinster. He was originally named Fith, and he may have been ordained a deacon at Auxerre with Patrick and Auxilius.
Iserninus is referred to as a bishop in the Annals of Ulster, and he is recorded as having begun his mission in 439 AD. According to Patrick F. Moran, St. Patrick assigned the valley of the Liffey to Auxilius and Iserninus.[1]
Modern studies
According to historian Charles Thomas, "The weight of current opinion is perhaps in favour of associating Secundinus, Auxilius, and Iserninus with Palladius rather than with Patrick."[2]
A tradition at Aghade, County Carlow, holds that Iserninus founded a church there and was later buried there.[3] Iserninus is also called the founder of the church at Old Kilcullen, where he was reputedly appointed as bishop by St. Patrick, possibly along with St. Mactail.[4] Kilcullen began as a monastic settlement, in the period around 448. The choice of location for the settlement was perhaps related to the nearby Dun Ailinne,[5] a ceremonial site related to the kings of Leinster.
^Johnston, Susan; Wailes, Bernard (2007), Dún Ailinne: Excavations at an Irish Royal Site 1968–1975, Philadelphia: University Museum Publications, ISBN978-1-931707-99-2
Sources
Dumville, David N. "Auxilius, Iserninus, Secundinus and Benignus." In Saint Patrick, AD 493-1993, ed. by David N. Dumville and Lesley Abrams. Studies in Celtic history 13. Woodbridge: Boydell, 1993. pp. 89–105. ISBN0-85115-332-1.