On the destruction of Iona by the Danes, the bishopric was first transferred to Dunkeld (850-864); then to Abernethy (865-908), when the Round Tower was probably built;[31] and in 908 it was transferred to St. Andrews, which retained it until the Reformation. St. Adrian was probably one of the three bishops of Alban[32] at Abernethy, as chapels and crosses in the district are all connected with his name; and Cellach appears as the first Bishop at St. Andrews, and he was succeeded by eight Culdee bishops, the last of whom was Fothad, who officiated at the marriage of Malcolm Canmore and Queen Margaret. The next three bishops all died before consecration, and for about sixteen years after the death of Malcolm the bishopric would appear to have been vacant. Turgot, Queen Margaret's friend and confessor, was the thirteenth bishop, and ruled from 1107-1115--the first bishop not of native birth. Prior to 1107 the Culdee community had split up into two sections, dividing the spiritualities and temporalities between them, and Bishop Robert (1121-1159), with the object of superseding the Culdees, founded in 1144 a priory for the regular monks of St. Augustine, granting to them the Hospital of St. Andrews, with portions of the altarage. In the same year King David granted a charter to the prior and canons of St. Andrews, in which he provided that they shall receive the Keledei of Kilrimont into the canonry, with all their possessions and revenues, if they were willing to become canons-regular; but, if they refused, those who are now alive are to retain the property during their lives, and, after their death, as many canons-regular are to be instituted in the church of St. Andrews as there are now Keledei, and all their possessions are to be appropriated to the use of the canons. There were thus two rival ecclesiastical bodies in St. Andrews--the old corporation of secular priests and the new order of Austin-canons; the former enjoyed the greater part of the old endowments, and the latter recovered a considerable portion of the secularised property that had passed into lay hands. Popes, bishops, and kings endeavoured to end this rivalry, but their efforts were not crowned with success; although influence was on the side of the canons-regular, the Keledei clung to their prescriptive right to take part in the election of a bishop down to 1273, when they were excluded by protest; in 1332 they were absolutely excluded, and the formula of their exclusion from taking part in the election was repeated;[33] we hear of them afterwards not as Keledei, but as "the provostry of the Church of St. Mary of the city of St. Andrews," of "the Church of the Blessed Mary of the Rock," and of "the provostry of Kirkheugh"--the society consisting of a provost and ten prebendaries.[34]