[Illustration: PLATE LVI. S. THEKLA. NORTH SIDE, FROM THE NORTH-WEST.]
[Illustration: S. THEKLA. EAST END. _To face page 208._]
On page 209, note 3, I have said that if the mosque Aivas Effendi (more correctly Ivaz Effendi), which is situated behind the Tower of Isaac Angelus within the old area of the palace of Blachernae, could be proved to stand on the site of a church, the argument in favour of the identification of the Church of S. Thekla with Toklou Dedé Mesjedi would be weakened. Since this book went to the press, my learned friend Mr. X. A. Siderides has shown me a passage in the historical work of Mustapha Effendi of Salonica, published in 1865, where the mosque of Ivaz Effendi is described as a church converted into a mosque by a certain Ivaz Effendi who died in 1586, at the age of ninety. In that case we should have a Christian sanctuary whose position corresponded strictly with the position occupied by the Church of S. Thekla "in the palace of Blachernae," an indication not exactly accurate in regard to Toklou Dedé Mesjedi. In view of the late date of Mustapha Effendi's work, and the absence, so far as I can judge, of Byzantine features in the structure of the mosque, it is difficult to decide if the arguments in favour of the identification of the Church of S. Thekla with Toklou Dedé Mesjedi are entirely overthrown by the statement of Mustapha Effendi.
A second consideration in support of this identification is the statement made by Achmed Rifaat Effendi, that before the church became a mosque it was known by the name of its founder, 'Isakias.' For it is a matter of history that the church of S. Thekla was restored by the Emperor Isaac Comnenus[338] in the eleventh century. The association of his name with the building was therefore perfectly natural, if the building is indeed the old church of S. Thekla, otherwise it is difficult to account for that association.
There is, however, one objection to this identification that must not be overlooked. According to Byzantine authorities, the church of S. Thekla stood in the palace of Blachernae ([Greek: entos tôn basileiôn; en tô palatiô tôn Blachernôn][339]). That palace occupied the heights above Aivan Serai, on which the quarter of Egri Kapou and the mosque of Aivas Effendi now stand, within the walls that enclose the western spur of the Sixth Hill. Toklou Ibrahim Dedé Mesjedi, however, does not stand within that enclosure, but immediately to the north of it, on the level tract that stretches from the foot of the Sixth Hill to the Golden Horn. If the reasons in favour of regarding the mosque as S. Thekla were less strong, this objection would, perhaps, be fatal. But the strip of land between the northern wall of the palace enclosure and the sea is so narrow, and was so closely connected with the life of the imperial residence, that a building on that tract might with pardonable inaccuracy be described, as 'in the palace.'[340]