Tathan was a Celtic missionary and theologian who lived during the fifth or sixth century. Originally from Ireland, he traveled to Wales, where he is recognized as an early abbot of Caerwent. According to historical accounts, he chose a life of spiritual devotion over inheriting his father's throne, traveling to Britain with eight followers. He established a monastic school at Venta Silurum that attracted students from various regions, including the young Cadoc.
Life and work
Born as the son of an Irish king, Tathan dedicated himself to religious studies. After following divine guidance, he sailed to the Kingdom of Gwent via the River Severn. There, he founded a monastic school and a Christian church with support from local rulers. He served as a teacher to many, most notably instructing Cadoc, the son of King Gwynllyw.
Veneration
The saint is commemorated in the Catholic tradition on December 26. His legacy is preserved through several dedications in Wales, including sites at Llanvaches (also called Llandathan) and St Athan. These locations honor his role in establishing early Christian presence in the region.