It was Bishop Ralph who before 1108 built the church we know, and completed it save upon the west front, where only the lower parts of the south-western tower are Norman. But work earlier than his, Saxon work, may be seen in the south aisle of the choir, where there are two carved stones representing Christ with Martha and Mary and the Raising of Lazarus. Bishop Ralph's church was badly damaged by fire in 1114, and it would seem that the four western bays of the nave date from the following rebuilding and restoration. Then in 1187 the Cathedral was burnt again, and Bishop Seffrid vaulted it for the first time--till then only the aisles had been vaulted--building great buttresses to support this and re-erecting the inner arcade of the clerestory. Apparently the apse and ambulatory which till then had closed the great church, on the east had been destroyed in the fire. At any rate Bishop Seffrid replaced them with the exquisite retro-choir we have, and square eastern chapels. He did the same with the old apses of the transepts, and he recased the choir with Caen stone, using Purbeck very freely and with beautiful effect. All this work is very late Transitional, the very last of the Norman or Romanesque. Then in the thirteenth century, which was to see St Richard Bishop of Chichester, the beautiful south porch was built, a pure Early English work, the north porch almost as lovely and of the same date, and later the sacristy beside the south porch. In St Richard's own day the south- west tower was built as we see it. The Norman tower over the crossing was destroyed and a lighter one built in its place as we see, and the galilee was set up before the western doors. Then, too, the chapels were built out from the nave aisles, upon the north those of St Thomas, St Anna, and St Edmund, upon the south, those of St George and St Clement, things unique in England, and all largely works of the second half of the thirteenth century and the early Decorated style, which indeed give to the Cathedral, with its dark Norman nave, all its charm, its variety and delight. Not much later than this transformation of the nave, though the nave itself was not touched, was the rebuilding or rather the lengthening and transformation of the Lady Chapel. Fundamentally this beautiful Decorated chapel is a Norman work, transformed into a Transitional one, to be glorified and transfigured in the very end of the thirteenth century, and now spoilt as we see. All this was done either by St Richard himself, or with the money gathered at his shrine. In the first half of the fourteenth century little would appear to have been built, save that certain beautiful windows, as that in the end of the south aisle of the choir and that in the south transept, with Bishop Langton's tomb beneath it, were inserted, and the fine stalls were built in the choir.