The history of the See of Glasgow for five centuries after the death of St. Kentigern is almost a total blank; save for some dubious references to certain ecclesiastics supposed to have been the successors of the Saint, there is nothing to show the progress of the church in those days. The reforming zeal of Malcolm Canmore and Queen Margaret led to a revival of religion, as remarkable in its own way as the Protestant Reformation. The Culdees were supplanted by the Romanists, and the foundations were laid of a hierarchy that attained to vast power in Scotland. The reforms of the Queen were principally confined to the east coast--Dunfermline and St. Andrews--and it was not until her sixth and youngest son, David, Prince of Cumberland (afterwards David I.), ordered an "Inquisitio" as to the property belonging to the See of Glasgow in 1120, that any documentary evidence was made available on this point. Prince David had already procured the appointment of his chancellor and tutor John Eochey or Achaius to the bishopric of Glasgow, and with the installation of that prelate a new era began in the history of the city. The Inquisitio or Notitia showed that the lands possessed by the Bishop of Glasgow were co-extensive with the kingdom of Strathclyde, and were in the upper ward of Lanarkshire, and the counties of Peebles, Roxburgh, and Dumfries. Bishop John Achaius was consecrated in 1115; Prince David came to the throne in 1124; and shortly after this accession the Bishop began the building of the Cathedral, which was dedicated to St. Kentigern on the nones of July, 1136. Bishop John Achaius died in 1147, and the Cathedral which he built did not long survive him. It is probable that it was a wooden structure, for it was destroyed by fire in 1176, and in that year Bishop Jocelin (1175-1199) began to rebuild it with stone. The next "building Bishop" was William de Bondington (1233-1258), who completed the Lower Church (or Crypt) and the Choir. Bishop William Lauder (1408-1425) began the erection of the present tower, and partly built the Chapter-house. These portions were completed by his successor Bishop John Cameron (1426-1446). Robert Blacader (1484-1508), the first Archbishop of Glasgow, erected the crypt at the south transept known as "Blacader's Aisle," built the splendid rood-screen and the stairs leading from the Nave to the Choir and Lower Church, and put the finishing touches to the Cathedral, which had thus taken nearly four hundred years to reach completion.