The nave and its aisles were intended to be at least nine bays long. In the underpinning of the side aisles in 1875-76, the bases of Gundulf's buttresses were discovered, his foundations being easily distinguishable from later ones, and the curious fact was then made manifest that he did not finish the nave westwards. On the south side his work stops half a bay from the present west front, and on the north it only extends three bays to the west of the present transept. It is interesting to note that it is just from this point that it was, in the seventeenth century, found necessary to start the rebuilding of a portion of the north aisle wall. Taking it for granted that the nave arcades were, after the old English traditional manner, continued to the choir arch, we conclude that Gundulf completed nine arches on the south and five on the north side. The bishop probably finished the south aisle that he might build the cloister and monastic buildings against it in their usual positions; but did not deem the north so important, as it would be of no such ulterior use. In the same way the choir was finished, while the nave, or parochial portion, in which the monastic establishment had less interest, was possibly left to the townsmen, and remained longer incomplete. All that the monks most wanted,--enough of the nave to secure the stability of the choir and transepts, and the south wall that supported their cloister,--was built under Gundulf's direction. It has been thought likely that the nave was completed by the parishioners before the later Norman period. If so, the builders of that time seem to have swept away all the townsmen's work, probably because of its ruder execution. Gundulf's arcades consisted, apparently, of two plain square-edged orders; the plan of his piers is not known. We do not seem to have any of his work, now, above the first string course in the nave. The triforium, in its present form at any rate, is, like the casing of the piers and the outer decorated order of the arches, of later Norman work. The cathedral, or rather the part described above as Gundulf's work, seems to have been erected by 1087, in which year William the Conqueror bequeathed some money, robes, and ornaments to it. The monastic portions were certainly finished before Lanfranc's death in 1089.