Saint Cadoc or Cadog, born c. 497 or before, was a 5th–6th-century Abbot of Llancarfan, near Cowbridge in Glamorganshire, Wales, a monastery famous from the era of the British church as a centre of learning, where Illtud spent the first period of his religious life under Cadoc's tutelage. Cadoc is credited with the establishment of many churches in Cornwall, Brittany, Dyfed...