While the Bishop's Castle was the centre of ecclesiastical influence, the first extension of Glasgow was due to the erection of manses for the minor officials of the Cathedral. To any one acquainted with the topography of Glasgow, the city may be thus "skeletonised" to show the manner of its evolution. The Cathedral stands on an eminence rising gradually from the north bank of the Clyde, and is distant about a mile from the river. The main route from the Cathedral to the Clyde is by an almost straight succession of streets--High Street and Saltmarket--which, unquestionably, follow the line of an ancient footpath. The origin of secular Glasgow was a small collection of huts inhabited by salmon-fishers on the bank of the river. A pathway was formed in course of time between this primitive village and the Cathedral, but for centuries there were no continuous buildings between these two points. In the time of Bishop Jocelin (1175-1199) the village had extended so far along the river-side and up the line of the present Saltmarket that the Bishop deemed it advisable to obtain from William the Lion the grant of a weekly market and an annual fair. About this time also, arrangements were made for the erection of manses for the ecclesiastics near the Cathedral. These houses were built on a road running at right angles with the footpath to the river, the part going westward being called the Rottenrow (Ratoun Raw), while the eastward route was called the Drygait. There was thus a sacerdotal burgh in process of formation on the summit of the hill beside the Cathedral, while a secular burgh was gradually developing on the bank of the river. In the course of centuries these two burghs were conjoined, and thus the "backbone" of Glasgow was formed. The ecclesiastical houses were, of course, more elaborate than those used by the fishermen and tradesmen who were soon attracted to the place by the wealth of the Cathedral; and thus it has happened that the greatest commercial city in Scotland--the second in the United Kingdom--took its rise from the houses of the ecclesiastics by whom the burgh was ruled for a very long period.