The most complete and remarkable of these buildings is the Mosque of Bib-el-Mardom, now known as the Cristo de la Luz. It is situated to the north of the city, between the Puerta del Sol and the Puerta Bisagra. Here Alfonso VI., on entering Toledo on May 25, 1085, halted and caused Mass to be celebrated, leaving his shield behind him as a memento of the incident. The exterior of this most interesting building is unpromising. It is thus described by Mr. Street: “The exterior face of the walls is built of brick and rough stone. The lower part of the side wall is arcaded with three round arches, within the centre of which is a round horseshoe arch for a doorway; above is a continuous sunk arcade of cusped arches, within which are window openings with round horse-shoe heads. The lower part of the walls is cut with single courses of brick, alternating with rough stonework; the piers and arches of brick, with projecting labels and strings also of unmoulded brick. The arches of the upper windows are built with red and green bricks alternated.” Restorations carried out in 1899 brought to light a most interesting pierced frieze running round the north-eastern façade, and serving as a sort of ventilator. Above was deciphered the following inscription in Arabic characters: “In the name of God, the Compassionate, the Merciful. This mosque was rebuilt ... the renewal of its upper part, proposing to render it more beautiful, and [the restoration] was finished, with the help of God, under the direction of Musa Ibn Ali, the architect, and of Saada. It was completed in the Muharram of the year 370” [July 17, 979, to August 15, 980 A.D.] The whole façade of the edifice has been much disfigured by successive reconstructions, coatings of plaster, &c., and has undergone much more serious transformation than the interior.