There can be no doubt that the mosque Gul Jamissi (mosque of the Rose), that stands within the Gate Aya Kapou, near the Golden Horn, was the Byzantine church of S. Theodosia. For Aya Kapou is the entrance styled in Byzantine days the Gate of S. Theodosia ([Greek: pylê tês hagias Theodosias]), because in the immediate vicinity of the church of that dedication.[257] This was also the view current on the subject when Gyllius[258] and Gerlach[259] visited the city in the sixteenth century. The Turkish epithet of the gate 'Aya,' Holy, is thus explained. Du Cange,[260] contrary to all evidence, places the church of S. Theodosia on the northern side of the harbour, or at its head, _ultra sinum_. The saint is celebrated in ecclesiastical history for her opposition to the iconoclastic policy of Leo the Isaurian. For when that emperor commanded the eikon of Christ over the Bronze Gate of the Great Palace to be removed, Theodosia, at the head of a band of women, rushed to the spot and overthrew the ladder up which the officer, charged with the execution of the imperial order, was climbing to reach the image. In the fall the officer was killed. Whereupon a rough soldier seized Theodosia, and dragging her to the forum of the Bous (Ak Serai), struck her dead by driving a ram's horn through her neck. Naturally, when the cause for which she sacrificed her life triumphed, she was honoured as a martyr, and men said, 'The ram's horn, in killing thee, O Theodosia, appeared to thee a new Horn of Amalthea.'[261] [Illustration: PLATE XLIII. (1) S. THEODOSIA. THE EAST END. (_E. M. Antoniadi._) (2) S. THEODOSIA, FROM THE SOUTH-EAST. _To face page 164._]