The Crystal Cathedral

In the case of monastic cathedral churches, the internal government was that of the religious order to which the chapter belonged, and all the members kept perpetual residence.
The alternative of this was the cathedral ruled by a secular chapter; the dignities of provost, dean, precentor, chancellor, treasurer, etc., came into being for the regulation and good order of the church and its services, while the non-residence of the canons, rather than their perpetual residence, became the rule, and led to their duties being performed by a body of "vicars", who officiated for them at the services of the church.