The principal chamber (cella) within the colonnade contained the colossal statue of Athenè Parthenos (see below, Nos. 300-302). Externally the cella was decorated with a frieze in low relief (see below, p. 145). The two pediments, or gables at each end of the building (see below, Nos. 303, 304) were filled with figures sculptured in the round. Above the architrave, or beam resting on the columns, were metopes, or square panels, adorned with groups in very high relief, which served to fill up the spaces between the triglyphs, or groups of three vertical parallel bands, representing beam ends. All these sculptured decorations were executed, like the architecture, in Pentelic marble. [Illustration: Fig. 8.--Plan of the Parthenon. (From Michaelis.)] The statue of the Parthenos is known to have been in existence about 430 A.D.; but not long after this date the figure was removed, and the Parthenon was converted into a Christian church, dedicated at first to Santa Sophia (or the Divine Wisdom), and afterwards to the Panagia (or Virgin Mary). For the purposes of the church, an apse was built at the east end of the cella, and the entrance was moved to the west end. The building was also given a vaulted roof, which covered the cella alone. In consequence the frieze was exposed to the weather, and the east pediment was much destroyed. From 1206 to 1458, during the period of the Frankish Dukes of Athens, the Parthenon was a Latin church. Athens was taken by the Turks in 1458, and the Parthenon was again an Orthodox Greek church for two years. In 1460, however, it was converted into a Turkish mosque. From this date it probably suffered little until 1687, when Athens was taken by the Venetian General, Morosini. In the course of a bombardment of the Acropolis, the besiegers succeeded in throwing a shell into a powder magazine in the Parthenon, and caused an explosion that destroyed the roof and much of the long sides of the building. Further injury was done by Morosini, who made an attempt to take down the central group of the west pediment, which was still nearly complete. Fortunately, many of the sculptures had been drawn by a skilful artist before the explosion. In 1674 Jacques Carrey, a painter in the suite of the Marquis de Nointel, French ambassador at the Porte, made sketches of large portions of the frieze and metopes, and of the then extant portions of the pedimental compositions. These drawings are preserved in the French Bibliothèque Nationale, and are constantly referred to in discussions of the Parthenon sculptures. In 1688 Athens was restored to the Turks, and from this date to the end of the last century the sculptures of the Parthenon were exposed to constant injury. Some of them were made into lime, or built into walls by the Turkish garrison; others were mutilated by the travellers who from time to time obtained admission to the Acropolis, and broke off portable fragments of the sculptures.