|Today's Bangor Abbey|
Bangor was established sometime between 552 and 555. The Rule of St. Comgall survives from the 7th century in the Ambrosian Library at Milan and is referred to as The Antiphonary of Bangor. It was carried to Bobbio at some point in history by an Irish monk. Comgall oversaw his monastery for 50 years. It was known all over Europe as a great center of learning. As many as 3,000 monks may have studied there at one time and the monastery prospered until the Dane invasion of 822. The abbey was rebuilt in the 12th century and modeled after Armagh, the largest church in Ireland at the time. You can read more about the history here.