Rev. Alban Butler (171173). Volume III: March. The Lives of the Saints. 1866.
St. Senan, Bishop and Confessor
HE was born in the country of Hy-Conalls in Ireland, in the latter part of the fifth century, was a disciple of the abbots Cassidus and Natal, or Naal: then travelled for spiritual improvement to Rome, and thence into Britain. In this kingdom he contracted a close friendship with St. David. After his return he founded many churches in Ireland, and a great monastery in Inis-Cathaig, an island lying at the mouth of the river Shannon, which he governed, and in which he continued to reside after he was advanced to the episcopal dignity. The abbots, his successors for several centuries, were all bishops, till this great diocess was divided into three, namely of Limerick, Killaloe, and Ardfert. St. Senan died on the same day and year with St. David; but was honoured in the Irish church on the 8th of March. A town in Cornwall bears the name of St. Senan. See his acts in Colgan, p. 602.