Dyfnan

Dyfnan was an obscure Welsh saint of the 5th century, sometimes accounted a son of Brychan, the Irish king who invaded Brycheiniog; some genealogies, such as the Cognatio de Brychan, do not mention him as such. The church of Llanddyfnan on Anglesey was dedicated to him and claimed his relics; tradition says he is buried there and founded the first church, now replaced by a 14th-⁠century church dedicated to him. He is patron of the place. The day of commemoration varies by source between 21 and 24 April: Nicholas Roscarrock gives 21 April, the calendar of Llyfr Plygain of 1633 gives 22, Allwydd Paradwys of 1670 and Browne Willis give 23, and the manuscripts Peniarth 219 and Additional 14882 give 24 April. Venerated in the Celtic tradition, with no known synodal canonization.