Considerable interest is attached to the Church of St. Demetrius, situated within the walls a few paces to the east of Atik Mustapha Pasha Djamissi; for although the present edifice dates only from the beginning of the eighteenth century, the original building was a Byzantine foundation, adorned with mosaics and surmounted by a dome. Its full style was the Church of St. Demetrius of Kanabus (τοῦ Καναβοῦ), and may, as the Patriarch Constantius suggests,[669] have been erected by a member of the family of the Nicholas Kanabus who became emperor for a few days, in the interval between the overthrow of the Angeli and the usurpation of Murtzuphlus, during the troublous times of the Fourth Crusade.[670] In 1334, the church was the property of George Pepagomenos, a relative of Andronicus III.[671] After the Turkish Conquest the church became, from 1597 to 1601, the cathedral of the Greek Patriarch, when he was deprived of the use of the Church of the Pammakaristos (Fethiyeh Djamissi).[672] Soon after leaving the Church of St. Demetrius, and before reaching the gate now styled Balat Kapoussi, the city wall was pierced by three large archways, 45 to 55 paces apart, and alternating with three towers. Balat Kapoussi being only 55 paces beyond the easternmost archway, here stood four entrances into the city, in most unusual proximity to one another. The first, or westernmost archway was, at one time, adorned with a bas-relief on either side. Tafferner, chaplain to Count Walter of Leslie, ambassador from the German Emperor Leopold I. to the Ottoman Court in the seventeenth century, describes the archway as follows: “In decensu clivi defluentis in Euxini brachium, porta perampla et obstructa muro conspicitur. Fama fert limitum hunc fuisse aulæ magni Constantini. Ad dextrum portæ latus adstat Angelus a candido et eleganti marmore effigiatus, statura celsior, ac virilem præ se ferens, et inserto muro. Ad lævam, Deipara visitur, proportione priore consimilis, atque ab Angelo consulatuta.”[673] [Illustration: Nikè (Formerly Adorning Archway Near Balat Kapoussi).] Only the bas-relief which stood on the eastern side of the archway has survived to our time.[674] It represents a winged female figure, attired in a flowing robe, and holding in her left hand a palm leaf—beyond all controversy a Nikè, not, as Tafferner imagined, the Angel of the Annunciation, nor, as the Patriarch Constantius supposed, the Archangel Michael.[675]