Cathmael is commonly identified with Cadoc or Docus, one of the most celebrated fathers of the Welsh Church. It is said there were two saints who bore that name; if so, Finnian's tutor must have been Cadoc the Elder. His mother was Gladys, the daughter or grand-daughter of the Irish chieftain, Brychan, who gave his name to Brecknock--so Cadoc "who has made a deep impression on the Celtic race," was not only of Irish blood, but was baptized, and trained up from his youth for many years, by an Irish anchorite named Meuthi, whose cell was in the neighbourhood of his father's castle. Afterwards he went to Givent in Monmouthshire, where he studied under another Irish master, St. Tathai. There he made great progress in learning and holiness--especially in the knowledge of the Sacred Scriptures, so that he was called Cadoc or Cattwy, the Wise. He was under Dubricius the founder and chief professor of the celebrated College of Llancarvan, near Cowbridge in Glamorgan. This became the most famous centre both of secular and sacred learning in Wales. A great number of young Irishmen crowded its lecture rooms, who afterwards became very famous in their own country, so that if Cadoc received much from Irishmen himself, he gave them even more in return. There can be no doubt that, as we shall see further on, he visited Ireland afterwards, and spent some time with those who were once his own pupils in Wales. The influence exercised over the Celtic Church in Ireland by David, Gildas, and Cadoc may be estimated from the fact already referred to, that they are said to have given a Mass to the Second Order of the Irish Saints. This would seem to imply that these saints, most of whom spent some time in Wales, adopted the liturgy of the Welsh Church, which may have in some respects differed from the older liturgy established by St. Patrick. Finnian was the great means of diffusing the learning and practices of Llancarvan in Ireland. He taught at Clonard, what he had himself learned or seen at St. David's and at Llancarvan; and thus became the means of diffusing the monasticism of the Welsh Church through most of Erin, especially in its southern parts.