The entrance to this chapel is flanked by the Capillas de San Pedro and de la Concepcion Grande. In the south aisle is the chapel of the Purification or of the Marshal, containing a remarkable altar-piece by Peter Kempener--exhibiting the portraits of the founder, Marshal Pedro Caballero, and his family. Adjacent is the Sala Capitular, in fine Renaissance style, the work of Gainza and Diego de Riaño (1531). The roof is formed by a fine cupola, supported by Ionic columns, beneath which is some admirable plateresco work, with escutcheons, triglyphs, etc. The hall contains a portrait of St Ferdinand by Francisco Pacheco, the “Conception” and ovals by Murillo, and the “Four Virtues” by Pablo de Céspedes. Beneath the windows are seen reliefs by Velasco, Cabrera, and Vazquez. The sacristy (Sacristia Mayor) is in the Renaissance style, and lies south of the Sala Capitular. It was built by Gainza in 1535, after designs by Riaño, who had died two years earlier. One of the three altars against the southern wall is adorned by the beautiful “Descent from the Cross” by Peter Kempener (a native of Brussels, called by the Spaniards Campaña), before which Murillo used to stand for hours in rapt contemplation. This priceless work of art was cut in five pieces by the French, with a view to its removal, and has not been very well restored. The sacristy contains also three interesting paintings, dating from the early sixteenth century, by Alejo Fernandez; and the “San Leandro” and “San Isidore” of Murillo. In this chamber is kept the treasury of the Cathedral. In it might be included the superb silver monstrance by Juan de Arfe (1580-87). It is twelve feet high, and richly adorned with columns, reliefs, and statuettes. The treasury likewise contains another monstrance, studded with 1200 jewels; a rock-crystal cup, said to have belonged to St Ferdinand; and the keys presented to that sovereign on the surrender of the city. That given by the Jews is of iron gilt, with the words, _Melech hammelakim giphthohh Melek kolhaaretz gabo_ (the King of kings will open, the King of all the earth will enter); the other key is of silver gilt and was surrendered by Sakkáf. The inscription upon it is in Arabic, and reads, _May Allah render eternal the dominion of Islam in this city_.