Callwen

Saint Callwen was a Welsh Christian of the early 6th century, of the family of Brychan. Almost nothing is preserved about her, and her existence is doubted: the origin of the name and its spelling are uncertain, and early sources do not mention her as a saint.

The Welsh Wikipedia counts her a granddaughter or great-⁠granddaughter of Brychan of Brycheiniog; in one list of saints she is his daughter, and so the sister of Cynog. She lived unmarried, dedicated to the service of God and of her fellow men. She founded a church at Ystradgynlais. The church of the village of Defynnog in Brecknockshire bore the name of Saint Callwen; when the Church in Wales built a new one, on 1 July 1893, its name was changed, and in 1964 to 1965 it was dedicated to Saint John, but the locals still call it "Santes Callwen". The village of Cellan on the river Teifi is said, according to Edward Lhuyd, to have taken its name from the spring Ffynnon Callwen. Her day is 1 November, together with her sister, Saint Gwenfyl, by the Western calendar (new style). She is honored as a saint of the undivided Church.