Gwynno

Gwynno, or Gwynnog ab Gildas, is the name of a 6th-century Welsh saint

Archives at the Vatican record that his festival is 26 October; that he is regarded as a confessor; and that there is said to be a sacred well, Ffynnon Wyno, associated with Llanwonno, in Glamorganshire.

Gwynno appears to have been the son of Cau, called Euryn y Coed aur.

During the Yellow Plague of 547, the monks of the dead Illtyd went for safety from West Wales to Brittany. Instead of returning to Pembrokeshire, they travelled east to Glamorgan to settle at Llantwit Major (Llanilltud Fawr in Welsh). It appears that Saint Illtud's monks were accompanied to Glamorgan by several of his disciples and associates, some of whom were Bretons, among them Gwynno.

The Celtic Bishop, Saint Dyfrig, founded three centres of learning in South-East Wales - at Llancarfan (near Cowbridge), Caerworgorn (now Llantwit Major), and Caerleon. Gwynno was one of the early members of the community at Llancarfan.

Under the name of Gwynno, he is considered to have been one of the three founders of Llantrisant, Glamorganshire, together with Illtyd and Dyfodwg; Llanwynno, a chapel under Llantrisaint, is dedicated to him.