St Dyfnog's Well ( Ffynnon Dyfnog ) , Llanrhaeadr , near Denbigh , Denbighshire . St Dyfnog's ell?is really a powerful spring which gushes out of a rocky bank and into a bathing pool. Here St Dyfnog lived in the sixth century, doing penance for his sins by standing under the freezing water, his hair shirt clamped to his body with iron bands. The water was believed to have powerful healing qualities - like most healing wells it was good for skin compaints, but according to some it could cure smallpox, deafness and dumbness. It was still popular in the eighteenth century, when the bathing pool was paved with marble, decorated with carvings and surrounded by bathing rooms.