Bangor Cathedral, Caernarvonshire
The site of Bangor Cathedral was originally occupied by St. Deiniol's monastery, established in the 6th century around c.525 on land given by the king of Gwynedd, Maelgwn Gwynedd. Deiniol is said to have been consecrated as a bishop by Saint David, making him the first Bishop of Bangor. This monastery was sacked in 634 and again in 1073. Nothing of the original building survives.
Rev. C. Arthur Lane Illustrated Notes on English Church History (London: Society for Promoting Christian Knowledge, 1901)