NIDAN, the son of Gwrfyw ab Pasgen ab Urien Rheged, was Periglawr or Confessor to the monastery of Penmon. He was the founder of the church of Llanidan, in Anglesey.
The old church, one of the largest in the Island, which consisted of nave and side aisle and chancel, has long since been abandoned and allowed to fall into ruin, and a new church erected in a more convenient spot, near Bryn Siencyn. But two bays of the West end retain their roof, and are kept in repair, as well as the North and South porches. The latter has a stoup for holy water that remains perpetually replenished in a manner that is not easily explained. All the church and churchyard is dry, yet there must be a spring beneath the south porch from which the water rises through capillary attraction to the stoup. The latter may be emptied, but speedily fills again. The level of the water in it is not always the same, at times drops fall from it ; and the entire porch is covered with an overgrowth of ivy and moss and weed. The churchyard around is still in use, and the roofed portion of the church serves as a mortuary chapel. In the roofed part is preserved a curious stone reliquary, resembling a small stone coffin, with a coved lid of the same stone, which is placed on an oak buffet against one of the walls. It is of a fine grained sandstone, and measures 26 inches long, 14 inches broad, and about 18 inches high. The front is open, to enable the relics to be seen. It was discovered, containing some pieces of bone, about the year 1700, under the altar, some two feet down, where probably it had been concealed at the Reformation. It is probably of the fourteenth century, and is apparently unique in Britain, as is also the phenomenon of the everfilling stoup. 1 Nidan is known in Scotland, whither he is said to have gone with S. Kentigern, as one of the 665 monks who accompanied him from Llanelwy, and he made a foundation at Midmar. "The neighbouring parish to his in Anglesey is Llanfinen ; and it is curious that not far from Midmar is Lumphanan, afterwards said to be dedicated to S. Vincent, but primarily to S. Finan, for the name is only a corrupted form of Llanfinan, while Midmar is not far from Glengarden, which is dedicated to S. Mungo (Kentigern), so that we have here a group of Celtic dedications in the heart of Aberdeenshire." 2 Nidan, it should be mentioned, was related to S. Kentigern, his father, Gwrfyw, being that : aint's first cousin. S. Nidan is entered in the Martyrology of Aberdeen on November 3.