St Cadoc Cattwg) learnt the monastic life under St Tathan at Caerwent in Suth Wales. He was known as St Cadoc the Wise and has left a collection of his writings in Welsh. He planted a church at Llangattock (Llancatwg) near the Usk and founded the monastery at Llancarfan in 515 in the Vale of Glamorgan which became famous for its learning. He founded many other churches, in Wales and in Scotland.and travelled to Cornwall and Brittany . He used to visit Flat H olm island in the Severn Estuary for solitude and prayer. The Life of St Cadoc was written in the 12C and contains many miracles,
Troparion of St.Cadoc Tone 5
Having been raised to piety, O Hierarch Cadoc,
thou didst dedicate thy life to God,
serving Him in the monastic state.
As with joyful heart thou didst fulfill thy daily obedience,
caring for the earthly needs of countless poor,
look now upon our spiritual poverty
and beseech Christ our God, that He will grant us great mercy.