What has been assumed above receives striking confirmation from excavations made recently (1903) in the motte of Clifford's Tower. At the depth of 13 feet were found remains of a wooden structure, surmounted by a quantity of charred wood.[801] Now the accounts of the destruction of the castles in 1069 do not tell us that they were burned, but thrown down and broken to pieces.[802] But the keep which was restored by William, and on the repair of which Henry II. spent 15_l._ in 1172,[803] was burnt down in the frightful massacre of the Jews at York Castle in 1190.[804] The excavations disclosed the interesting fact that this castle stood on a lower motte than the present one, and that when the burnt keep was replaced by a new one the motte was raised to its present height, "an outer crust of firmer and more clayey material being made round the older summit, and a lighter material placed inside this crater to bring it up to the necessary level." This restoration must have taken place in the third year of Richard I., when 28_l._ was spent "on the work of the castle."[805] This small sum shows that the new keep also was of wood; and remains of timber work were in fact found on the top of the motte during the excavations, though unfortunately they were not sufficiently followed up to determine whether they belonged to a wooden tower or to a platform intended to consolidate the motte.[806] It is extremely likely that this third keep was blown down by the high wind of 1228, when 2s. was paid "for collecting the timber of York Castle blown down by the wind."[807] In its place arose the present keep, one of the most remarkable achievements of the reign of Henry III.[808] The old ground-plan of the square Norman keep was now abandoned, and replaced by a quatrefoil. The work occupied thirteen years, from the 30th to the 43rd Henry III., and the total sum expended was 1927_l._ 8_s._ 7_d._, equal to about 40,000_l._ of our money. This remarkable fact has slumbered in the unpublished _Pipe Rolls_ for 700 years, never having been unearthed by any of the numerous historians of York.