of architects, this cruciform section presents an interesting blend of styles. The first two architects introduced Gothic elements into the design which are visible in the elaborate tracery design of the stone vaults over the transept arms and above the altar. Juan de Ochoa finished the structure in a more Mannerist style typical at the time, finishing the project with an elliptical dome over the crossing and a barrel vault ceiling – with lunettes along the side – over the choir area. The design and decoration of the ensemble includes extensive iconography. The Gothic-style vault over the main altar is carved with images of musical angels, saints, apostles, and an image of Emperor Charles V (Carlos V), with an image of Mary at the center. The many writings spread amongst the images in turn form a long litany to Mary. The elliptical dome of the crossing rests on four pendentives which are sculpted with images of the four evangelists. On the dome itself, are the images of the eight Fathers of the Church along the outer edge and an image of the Holy Trinity at its center, which together are part of a Counter-Reformist iconographic program. Over the choir area, the central area of the barrel vault ceiling is occupied by images of the Assumption, Saint Acisclus and Saint Victoria, while the sides feature images of David, Solomon, Daniel and Samuel along with the theological virtues. Main altar The altar of the Capilla Mayor was begun in 1618 and designed in a Mannerist style by Alonso Matías. After 1627 the works were taken over by Juan de Aranda Salazar, and the altar was finished in 1653. The sculpting was executed by the artists Sebastián Vidal and Pedro Freile de Guevara. The original paintings of the altar were executed by Cristóbal Vela Cobo but they were replaced in 1715 by the current paintings by Antonio Palomino. The altar consists of three vertical "aisles" flanked by columns with composite capitals. The central aisle houses the tabernacle (executed by Pedro Freile de Guevara) at its base, while its upper half is occupied by a canvas of the Assumption. The two aisles on the side contain four more canvases depicting four martyrs: Saint Acisclus and Saint Victoria on the bottom halves and Saint Pelagius and Saint Flora in the upper halves. The upper canvases are flanked by sculptures of Saint Peter and Saint Paul,