The keep was probably the first work in stone at York Castle, and for a long time it was probably the only defensive masonry. The banks certainly had only a wooden stockade in the early part of Henry III.'s reign, as timber from the forest of Galtres was ordered for the repair of breaches in the _palicium_ in 1225.[809] As late as Edward II.'s reign there was a _pelum_, or stockade, round the keep, on top of a _murus_, which was undoubtedly an earthen bank.[810] At present the keep occupies the whole top of the motte except a small _chemin de ronde_, but the fact so frequently alluded to in the writs, that a stockade ran round the keep, proves that a small courtyard existed there formerly, as was usually the case with important keeps. Another writ of Edward II.'s reign shows that the motte was liable to injury from the floods of the River Fosse,[811] and probably its size has thus been reduced. The present bailey of York Castle does not follow the lines of the original one, but is an enlargement made in 1825. A plan made in 1750, and reproduced here, shows that the motte was surrounded by its own ditch, which is now filled up, and that the bailey, around which a branch of the Fosse was carried, was of the very common bean-shaped form; it was about 3 acres in extent. The motte and bailey were both considerably outside what is believed to have been the Anglo-Saxon rampart of York,[812] but the motte was so placed as to overlook the city. The value of the city of York, in spite of the sieges and sacks which it had undergone, and in spite of there being 540 houses "so empty that they pay nothing at all," had risen at the date of the Survey from 53_l_. in King Edward's time to 100_l._ in King William's.[813] This extraordinary rise in value can only be attributed to increased trade and increased exactions, the former being promoted by the greater security given to the roads by the castles, the latter due to the tolls on the high-roads and waterways, which belonged to the king, and the various "customs" belonging to the castles, which, though new, were henceforth equally part of his rights.