Gwrnerth

Saint Gwrnerth is a Welsh saint of the undivided Church, the son of Saint Llywelyn, son of Tegonwy. An entry in the Iolo manuscripts gives him a brother, Gwyddfarch, a saint of Bangor Cybi in Anglesey. Both he and his father are connected with Trallwng, that is Welshpool, in Powys.

The fourteenth-⁠century Red Book of Hergest preserves a verse dialogue of thirty triplets between Gwrnerth and his father, attributed to Saint Tyssilio. The inscription says the two were penitent saints at Trallwng who met for the last three hours of the night and the first three of the day to say their Matins and the Hours. It tells that Llywelyn, seeing Gwrnerth's cell shut one day and not knowing why, composed an englyn. Baring-⁠Gould considers that the inscription, if not the poem, cannot be much older than the manuscript.