The gradual development of the Cathedral necessarily led to the increase of the ecclesiastics connected with it. The elaborate ceremonial of the Romish Church required a staff of officials far out-numbering that of the simple Culdee _cella_ of St. Kentigern's time. No definite information is available as to the method adopted for supplying these officials in the early years of the Cathedral's existence. It is reasonable to suppose, however, that the Rectors and Parsons who had charges in the widely-scattered parishes under the control of the Bishop, would have stated periods when they would take their turns of officiating. These clergymen would likely reside temporarily in the Bishop's Palace, to which reference will be made presently. At a later date, as the grandeur of the Cathedral increased and its ceremonial became more ornate, houses were provided for them near the building, and thus a return was made to the social system of the Culdees, though with a celibate clergy. Even so recently as the middle of the present century, about twenty of the manses belonging to different prebends connected with the Cathedral could be identified in its immediate vicinity. It has been credibly conjectured that the remains of a building outside the north wall of the Cathedral mark the site of the Hall of the Vicars Choral, and a narrow lane between the Cathedral and the Bishop's Castle was known as the Vicar's Alley, probably because it gave access to the building. A consideration of some of these clerical homes will give an idea of the social life in a pre-Reformation Cathedral.