Turkish rule, and every ancient edifice which could not be turned to better account was brought into requisition to provide ready-made material for the new structures. During the reign of the Conqueror not less than sixty mosques rose within the city bounds. The Fortress of the Seven Towers, built in 1457, at the Golden Gate, was largely constructed with materials taken from old buildings, as an examination of its walls will prove. The first palace of the Sultan, on the site now occupied by the War Office, must have played havoc among the Byzantine buildings, secular and sacred, in that neighbourhood. While the palace which was erected later, in the unrivalled situation at the head of the promontory of Stamboul, encroached upon a territory crowded with such churches as S. Demetrius, S. George Mangana, S. Mary Hodegetria, and S. Irene. All were swept away, with the exception of the last, which was converted from a temple of peace into an arsenal of war. [Illustration: MARKET IN THE COURT OF THE MOSQUE OF SULTAN AHMED I. The courts of the mosques are often used for market-places.] The Turkish occupation is therefore accountable for the destruction of many ancient churches of the city. Indeed, if we may believe the historian of the Greek Patriarchate from 1453 to 1578, there was a moment when the Christian community was threatened with the loss of every church, old or new, in its possession. The graphic story is too long to be told here in all its details, but it is so characteristic of the parties concerned, and of the prevalent method (not yet quite obsolete), of creating and turning a difficult situation, that a summary account of the affair may be permitted. The scene is laid either in the reign of Selim I. or of his son Suleiman the Magnificent, when the Patriarch Jeremiah occupied the patriarchal throne for the second time. And the play opens with the determination of a fanatical Turkish party to insist upon the law that the inhabitants of a city captured by force of arms should be denied the right of worship, and should have their churches either confiscated or levelled to the ground. The Sheik-ul-Islam of the day had issued his fetva to that effect, and in five days the sentence was to be carried into execution. A high Turkish official, who was in the secret, informed a Greek notable of the storm at hand, and the latter reported the matter immediately to his ecclesiastical chief. After much weeping and many prayers, the patriarch mounted his mule and hastened to the residence of the Grand Vizier, with whom, happily, he was on the best of terms. The result of a long interview was that the patriarch was dismissed with an invitation to attend the Council of Ministers, and inform them that, while it was true that Sultan Mehemet attacked the city and destroyed a portion of the fortifications, the Greek Emperor had not carried matters to the bitter end, but went betimes to the Sultan, surrendered the keys of the city,