Saint Callwen was a member of the Brychan family of Wales who embraced a single life and dedicated herself to serving God and her fellow men.
[1] She was one of the children or descendants of Brychan and shares the festival on 1 November with her sister, Saint Gwenfyl.
[6] On 1 July 1893 a new Church of Saint Callwen was substituted for the older building in the parish of Glyntawe by Basil Jones, bishop of St David's.
The bishop, Ellen Elizabeth Gwyn, widow and patron of the parish and Reverend David Hughes, vicar, certified that the change would be convenient.
It is true that Edward Lhwyd mentions a spring near the church, called Ffynnon Callwen, from which he says that it is supposed that Cellan takes its name.