The Crystal Cathedral

Originally the bishop and cathedral clergy formed a kind of religious community, which, while not in the true sense a monastery, was nevertheless often called a monasterium, the word not having the restricted meaning which it afterwards acquired. In this lies the reason for the apparent anomaly that churches like York Minster and Lincoln Cathedral, which never had any monks attached to them, have inherited the name of minster or monastery. In these early communities the clergy often lived apart in their own dwellings, and were not infrequently married.
In the 8th century Chrodegang, bishop of Metz (743-766), compiled a code of rules for the clergy of the cathedral churches, which, though widely accepted in Germany and other parts of the continent, gained little acceptance in England.
According to Chrodegang's rule, the cathedral clergy were to live under a common roof, occupy a common dormitory and submit to the authority of a special officer. The rule of Chrodegang was, in fact, a modification of the Benedictine rule. Gisa, a native of Lorraine, who was bishop of Wells from 1061 to 1088, introduced it into England, and imposed its observance on the clergy of his cathedral church, but it was not followed for long there, or elsewhere in England.
• Late Middle Ages: monastic and secular cathedrals