Ffynnon Enddwyn is a Holy Well or Sacred Spring in the Merionethshire area of Gwynedd. The information sign at the well states:-
“Tradition says that Saintt Enddwyn was afflicted with a ‘sore disease’. One day, journeying to Trawsfynyedd, she bathed and refreshed herself in the well and was cured. The well was afterwards known as Fynnon Enddwyn. Sick folk from all parts resorted to it to be cured from gland related illnesses, skin diseases, sore eyes, and arthritis. It was a tradition to drink the water, and apply some of the moss that grew beside the well as a plaster. People left their crutches and sticks behind as tokens of their restoration, and others threw pins into the well to ward off evil spirits.”
The Church of Saint Enddwyn and the village of Llanenddwyn (Dyffryn Ardudwy) are both named after the saint. Little is unfortunately known about Saint Enddwyn, we do not know her feast day; and even her gender is open to dispute.