The choir shows the same gradual variation in style; and I have considerable difficulty in assigning a precise date to it. It is clear, however, that the whole of it is of much later date than the original foundation of the cathedral; and it is probable, I think, that it was reconstructed in the latter half of the thirteenth century. The windows in the chapels of the chevet are of two lights, with a small quatrefoil pierced in the tympanum above the lights. The mouldings of the groining are extremely bold and simple. The aisle-vaulting, too, is very simple and of early-pointed character, whilst the clustered columns round the apse look somewhat later. There is, however, no mark of alterations or additions; and I think, therefore, that the whole of this work must be of the same date, and that the difference visible between the various parts of it may be put down to the long lingering of those forms of art which had been once imported into this distant province, and to the consequent absence of development. The sculpture of the capitals in the chevet is nowhere, I think, earlier than about the end of the thirteenth century, though that in the chapels round it, being very simple, looks rather earlier. Unfortunately all the upper part of the choir was rebuilt about the same time that the eastern chapel was added. It has strange thin ogee flying buttresses, large windows, and a painted ceiling. Here, as at San Isidoro, Leon, the Host is always exposed, and, as I have mentioned before, two priests are always in attendance at faldstools on each side of the Capilla mayor in front of the altar. The interior, of course, has been much damaged by the destruction of the old clerestory of the choir. It is, nevertheless, still very impressive, and much of its fine effect is owing to the contrast between the bright light of the nave and the obscure gloom of the long aisles on either side of the Coro. The length of the nave, too, is unusually great in proportion to the size of the church; and though much of the sculpture is rude in execution, it is still not without effect on the general character of the building. On the north side of the nave a chapel has been added, which preserves the external arrangement of the windows and buttresses in the earliest part of the building, as they are now enclosed within and protected by it. The simple and rather rude buttresses are carried up and finished under the eaves’ corbel-tables with arches between them, so as to make a continuous arcade the whole length of the building on either side.