The origin of this well is a pleasing miracle, and recalls the story of Canute; but while Canute's effort to command the sea was a failure in the eleventh century, that of St. Illtyd five hundred years earlier was a brilliant success. It appears that the saint was very pleasantly established on an estate consisting of a field surrounded on all sides by plains, with an intermediate grove, but was much afflicted by the frequent overflowings of the sea upon his land. In vain he built and rebuilt a very large embankment of mud mixed with stones, the rushing waves burst through again and again. At last the saint's patience was worn out, and he said, 'I will not live here any longer; I much wished it, but troubled with this marine molestation, it is not in my power. It destroys my buildings, it flows to the oratory which we built with great labour.' However, the place was so convenient he was loth to leave it, and he prayed for assistance. On the night before his intended departure an angel came to him and bade him remain, and gave him instructions for driving back the sea. Early in the morning Illtyd went to the fluctuating sea and drove it back; it receded before him 'as if it were a sensible animal,' and left the shore dry. Then Illtyd struck the shore with his staff, 'and thereupon flowed a very clear fountain, which is also beneficial for curing diseases, and which continues to flow without a falling off; and what is more wonderful, although it is near the sea, the water emitted is pure.'[169]
Some of the Welsh mystic wells are so situated that they are at times overflowed by the waters of the sea, or of a river. Taff's Well, in Glamorganshire, a pleasant walk from Cardiff, is situated practically in the bed of the river Taff. One must wade through running water to reach it, except in the summer season, when the water in the river is very low. A rude hut of sheet iron has been built over it. This well is still noted for its merits in healing rheumatism and kindred ailments. The usual stories are told of miraculous cures. A primitive custom of the place is that when men are bathing at this well they shall hang a pair of trousers outside the hut; women, in their turn, must hang out a petticoat or bonnet.