Celynnin

Saint Celynnin lived in the sixth century and, according to Baring-⁠Gould, there were two saints of this name, one in north and one in south Wales. The northern one was one of the twelve sons of Helig ab Glanog of Tyno Helig, whose land was swallowed by the sea; the sons became monks at Bangor-⁠on-⁠Dee, and some of them at Bardsey. Churches dedicated to him are Llangelynnin in Caernarfonshire and another in Meirionnydd; the one in the Conwy valley, among the remotest and oldest in Wales, is said to have been founded by him. His holy well at Llangelynnin was known for healing weak children: mothers immersed them in the water early in the morning or in the evening.

His feast is given as 22 November or 2 November, depending on the place.