Petri Kapoussi, at the eastern extremity of the Castron, and in the outer wall, communicated with the street skirting the Golden Horn, and retains the ancient name of the district.[706] Dr. Mordtmann[707] identifies it with the Porta Sidhera (Σιδηρᾶ Πίλη), near the Convent of the Petrion.[708] That the Petrion was not confined to the Castron, but included territory on either side of the enclosure, is manifest from the fact that whereas the wall between the Porta Phani and the Porta Petri is without a single tower, mention is yet made of towers in the Petrion.[709] Of the churches in this quarter, St. Stephen of the Romans, St. Julianè, St. Elias, and St. Euphemia, the two last were the most important. The Church of St. Euphemia claimed to be an older foundation than Constantinople itself, being attributed to Castinus, Bishop of Byzantium, 230-237. It was restored by Basil I., and his daughters entered the convent attached to the church.[710] The Convent of Petrion, as it was called, must have been of considerable importance, for it was on several occasions selected as the place in which ladies of high rank, who had become politically inconvenient, were interned; as, for instance, Zoe, the dowager-empress of Leo the Wise, for conspiracy against Romanus Lecapenus;[711] Theodora, by her sister the Empress Zoe;[712] and Delassaina, the mother of the Comneni, with her daughters and daughters-in-law, by Nicephorus Botoniates.[713] In the assaults made by foreign fleets upon the Harbour Walls, the Petrion, or Phanar, occupied a conspicuous place. It was before the Petrion[714] that the Venetian galleys under Dandolo stood, July 17, 1203, and established the free end of their flying bridges upon the summit of the walls, whereby twenty-five towers were captured, and the city was recovered for Isaac Angelus. The Petrion was again prominent in the assault which the Crusaders delivered on April 12, 1204, when Constantinople passed into their hands and became the seat of a Latin Empire. Here the flying bridge of the ship _Pelerine_ lodged itself on a tower, and allowed a bold Venetian and a French knight, André d’Urboise, to rush across, seize the tower, and clear a way for their comrades to follow. Here ladders were then landed, the walls scaled, three gates forced, and the city thrown open to the whole host of the invaders.[715] In the siege of 1453, early on the morning of the 29th of May, the Phanar was fiercely attacked by the Turkish ships in the Golden Horn.[716] The attack was repulsed, and the Greeks remained masters of the situation, until the occupation of the city by the enemy’s land forces made further resistance impossible. The memory of the struggle is said to be preserved in the quarter by the name of the street Sandjakdar Youcousou (the Ascent of the Standard-bearer) and by the Turkish name for the Church of St. Mary Mougouliotissa, Kan Klissè (the Church of Blood).[717]