In addition to the western doorway there were four others in these screens, two on the north and two on the south; these opened into small chapels contrived in the space left between the screen just described, outside the columns, and the wooden screen inside the columns and behind the choir-stalls. The screen on the south side of the apse--the remains of what no doubt once went all round it--is even more elaborate than that round the Coro: it is pierced below, so that the altar may be seen, and has large statues of saints above, and an open-gabled parapet, finished with angels everywhere, and truly a most gorgeous work! This is in the south-west arch of the choir only, a late flamboyant screen having been added afterwards beyond it to the east, whilst on the north side a Berruguetesque monument has taken the place of the old screen. The last great middle-pointed feature is the chapel of San Ildefonso, at the extreme east end of the church. It is a most elaborate work, groined with an eight-sided vault; its windows and arches full of rich mouldings, and enriched by ball flowers and some of the other devices commonly seen in our own work of the same age. Each side of this chapel had an elaborate tomb with an arched recess in the wall over it, surmounted by a gabled canopy between pinnacles, and under which sculptured subjects are introduced.[241] These tombs were evidently all erected at the same time, and help to make the _tout ensemble_ of the chapel very rich and striking. A string-course is carried round above them; and above this there are large traceried windows, alternately of three and four lights. The vaulting-ribs are treated in an unusual and rather effective way, being fringed with a series of cusps on their under side, which give great richness to the general effect. There are small triangular vaulting compartments in the two western angles, which are necessary in order to bring the main vault to a true octagon in plan. The works added in the fifteenth century were both numerous and important. The cloister and chapel of San Blas, on its north side, are the first in importance. They owe their origin, indeed, to the previous century, the first stone having been laid on the 14th of August, A.D. 1389, by Archbishop Tenorio,[242] Rodrigo Alfonso being the master of the works. In the chapel is a fine monument of the Archbishop; and in the cloister walls a door which, in the capricious cusping and crocketing of its traceried work, illustrates the extreme into which the Spanish architects of this age ran in their elaboration of detail and affectation of novelty. The traceries of the whole of the windows of the cloister are destroyed, but the groining remains, and the proportions and scale of the whole work are both very fine.