Originally on the site of Bangor Cathedral, around 530, it was monastery founded by Saint Deiniol. It obtained the status of the cathedral in 546, when Deiniol was appointed a bishop by Saint David. In 634 and again in 1073 the monastery and church was plundered.
Burnt and robbed by the Vikings the cathedral was rebuilt around 1130, thanks to the efforts of king of Gwynedd, Gruffudd ap Cynan and bishop of St. David. The oldest preserved fragments of the building come from this period. In 1211, the cathedral suffered again, this time during the invasion of king John’s forces on Gwynedd. During the reconstruction, significant transformations were made, the apse was removed, and the chancel was extended. Further destruction was caused by the invasion of Edward I on Gwynedd in 1282, after which, during the removal of damages, the transepts were rebuilt. Work on the nave stretched to the late 14th century. A thorough rebuilding of the cathedral was carried out at the beginning of the sixteenth century by the bishop Skevington. Until 1532 a western tower was erected and among others the nave was rebuilt.
The great program of the church restaurant was conducted by George Gilbert Scott in 1868-1870, and his son, Jan Oldrid Scott, continued in 1879-1880. It was planned then to build a high central tower with a spire, but due to weak walls, emerging cracks and lack of funds, it was left as a low, unfinished construction. It was not until 1966-1967 that the tower was finished and a pyramidal top was placed on it.
The cathedral from the 12th century was built in the Norman style on a cruciform plan with one nave and an apse on the eastern side. The reconstruction of the 13th century resulted in the extension of the chancel and the removal of the apse. The present appearance in the form of a basilica church was obtained in the first half of the 16th century, when the nave was rebuilt and a bell tower from the western side was added. It was erected on a square plan, three-storey, with an entrance portal from the west side and a culmination in the form of decorative battlement. The chapter house and the sacristy were built only before 1721, also the tower at the intersection of naves is a modern addition.
Wooding J., Yates N., A Guide to the churches and chapels of Wales, Cardiff 2011.
Website wikipedia.org, Bangor Cathedral.