Worcester Castle was outside the town, from Speed's map, and was near the Severn. The area now called College Green was no doubt the outer ward of the castle, which was restored to the convent by Henry III. The tower called Edgar's Tower was built by the monks as the gatehouse to their newly conceded close.[790] From the map given by Green, this outer bailey appears to have been roughly square; but there was also a small oblong inner ward, retained by the king, where the gaol was afterwards built. The area of the castle is said to have been between 3 and 4 acres.[791] The motte, which is mentioned several times in mediæval documents,[792] was completely levelled in 1848; it was then found out that it had been thrown up over some previous buildings, which were believed to be Roman, though this seems doubtful.[793] The value of Worcester had risen since the Conquest.[794] YORK (Fig. 39).--William the Conqueror built two castles at York, and the mottes of both these castles remain, one underneath Clifford's Tower, the keep of York Castle, the other, on the south side of the Ouse, still bearing the name of the Baile Hill, or the Old Baile.[795] The _Anglo-Saxon Chronicle_ implies, though it does not directly state, that both these castles were built in 1068, on the occasion of William's first visit to York. The more detailed narrative of Ordericus shows that one was built in 1068, and the other at the beginning of 1069, on William's second visit.[796] Both were destroyed in September 1069, when the English and Danes captured York, and both were rebuilt before Christmas of the same year, when William held his triumphant Christmas feast at York.