The choir, as has been said, was a late addition in place of the original Romanesque apse. It was built in A.D. 1513, or a little after, by Juan de Badajoz, master of the works at the cathedral.[131] It is of debased Gothic design and coarse detail, but large and lofty. The groining at the east end is planned as if for an apse, and portions of diagonal buttresses, to resist the thrust of the groining ribs, are built against the east wall, in the way often to be noticed in the later Spanish buildings. The east window was of two lights only, and is now blocked up by the Retablo. In this church there is a perpetual exposition of the Host, and the choir is therefore screened off with more than usual care, none but the clergy being allowed to enter it. At Lugo, where there is also a similar exposition, the choir is left open, but two priests are always sitting or kneeling before faldstools in front of the altar. [Illustration: No. 14. SAN ISIDORO, LEON p. 126. SOUTH TRANSEPT.] I could not gain admission to the cloister on the north side of the church; it is large and all modernized, and surrounded by the buildings of the monastery, which is now suppressed. A chapel dedicated to the Holy Trinity was founded here in A.D. 1191, and a list of the relics preserved at its altar is given on a stone preserved in the convent. The chapel of Sta. Catalina, already described, is specially interesting on account of the remarkable paintings with which the whole of the groining is covered. These all appeared to me to have been certainly executed at the end of the twelfth century, circa A.D. 1180-1200, and they are remarkably rich in their foliage decoration, as well as in painting of figures and subjects. Beginning with the eastern central compartment, over the altar, and going round to the right, the subjects in the six bays of the vault are as follows:-- (1.) In this our Lord is seated in a vesica, at the angles of which are four angels, with the heads of the four Evangelists, with their books and names painted beside them. Our Lord’s feet are to the east, and He holds an open book and gives His blessing. (2.) The angel speaking to the shepherds, with the inscription, “_Angelus a pastores_.” (3.) The Massacre of the Innocents. (4.) The Last Supper, painted without the slightest regard to the angles formed by the groining, and as if the vault were a flat surface. (5.) _a._ Herod washing his hands. _b._ St. Peter denying our Lord. _c._ Our Lord bearing his Cross. _d._ The Crucifixion (this is almost destroyed). (6.) Our Lord seated with His feet to the west; the seven churches around Him, seven candles, and an angel giving the book to St. John.