Only one gateway remains, though there were four in the great wall which surrounded the precincts. The _Tower Gate_ is a fine structure, flanked by two towers, one of which is octagonal and the other semi-circular. The ruins of the _Bishop's Palace_, a magnificent structure, should be visited. It was built by Bishop Gower, and must have been one of the finest residences in the whole kingdom. THE INTERIOR The _Nave_ is the work of Peter de Leia (1176-1198), and is Transitional Norman. The elaborate carving and the richness of the ornamentation are remarkable, and the colour of the stone adds a wonderful effect. St. David's has many peculiar features, and is unlike any other church in the kingdom. The arches are round, the triforium and clerestory are blended together under one arch. The piers are round and octagonal, with attached shafts. It was evidently intended to vault the nave, but this was abandoned. A Perpendicular roof of intricate and unusual design was constructed about 1500. The capitals afford an interesting study. The west end is modern, the work of Scott. Traces of coloured decoration may be seen on some of the piers of the nave; among the designs are figures of the Virgin, our Lord, and some monarch. The font in the south aisle is, with the exception of the shaft, of the same date as the nave. It is octagonal, and is carved with an arcade of pointed arches. The aisles do not possess any special features of interest. The architectural changes which have taken place there have already been mentioned. In the north aisle is the Transitional Norman doorway, and in the south the Decorated door of Bishop Gower. The _Rood-Screen_ is very remarkable, the work of Bishop Gower in the Decorated style. It is very massive and elaborate, and contains several tombs and monuments, has a groined roof, and is a very unusual and noble structure. The organ, which is modern, stands above this screen. The iron gates leading to the choir are also modern. Before entering the choir we will visit the _Transepts_, which are entered through Late Norman doorways from the nave. The western walls are Late Norman, built by De Leia, the rest were erected after the fall of the tower in 1220. In the _North Transept_ the large north window was erected in 1846 in the Decorated style. This transept was dedicated to St. Andrew. On the east side is the Chapel of St. Thomas the Martyr, begun in 1220, refounded by Sir R. Symonds in 1329, and used for a variety of purposes. We notice a fine Early English piscina in the south wall. Above is the library and the old treasury. The _South Transept_, formerly known as the "Chanter's Chapel," had altars dedicated to the Holy Innocents and St. David, and was once used as a parish church. The east side of this transept has passed through several vicissitudes, and has now been restored to its original form.