Seiriol was an early 6th-century saint, who created a cell at Penmon Priory on Anglesey, off the coast of north Wales. He later moved to Ynys Seiriol.
The Old Church of St Nidan, Llanidan is a medieval church in the community of Llanidan, in Anglesey, North Wales, close to the Menai Strait. The first church on the site was established in the 7th cen
The surviving western section of St Nidan's and the central arcade
The new church, built (according to one 19th-century critic) in a "debased barbarous style"
The east window of the southern aisle, which reuses some 15th-century tracery, and the exposed woodwork of the roof
The exposed central arcade, which "rises from the graveyard like an abstract sculpture"