a vaulted and also painted, but rather dark place, with many small windows. On the outside of the walls of the church there is this inscription[452]-- [Illustration: Monogram in Greek.] In front of the porch, vestibulo, [Greek: propiliô] of this church Theodosius showed me the place where the last Christian emperor Constantine, intending to flee at the Turkish conquest of the city, is said to have fallen from his horse and to have been found dead.' [Illustration: FIGS. 88 AND 89.] [429] Scarlatus Byzantius, p. 369; Patr. Constantius, p. 81; Paspates, p. 304. [430] Leo Gramm. pp. 218, 222. [431] Siderides, in _Proceedings of the Greek Syllogos of C.P._ vol. xxviii. p. 265. [432] _Ibid._ p. 263. [433] _Proceedings of the Greek Syllogos of C.P._, _ut supra_, p. 258. [434] _Pasch. Chron._ p. 593. [435] _Die byzantinischen Wasserbehälter von Konstantinopel_, von Dr. Forscheimer und Dr. Strzygowski, pp. 62-63, 175-176. [436] _Ut supra._ [437] Mansi, viii. col. 990, col. 1054. [438] Miklosich et Müller, pp. 28, 50, 53, 54. [439] P. 305. On p. 163 he places the pier in its proper position. [440] _Esq. top._ p. 76; Archaeological Supplement to vol. xviii. of the _Proceedings of the Greek Syllogos of C.P._ p. 9. [441] _Türkisches Tagebuch_, pp. 455-56; cf. Crusius, _Turcograecia_ p. 190. [442] The question thus raised presents serious difficulties. That some building[A] in the neighbourhood of Kefelé Mesjedi was known by the name of Aetius[B] is undoubted. It was a cistern (Du Cange, i. p. 96), and formed one of the landmarks by which the church of S. John in Petra, situated in this quarter of the city, was distinguished (Du Cange, iv. p. 152 [Greek: engista tou Aetiou]). But while that is the case, Gyllius (_De top. C.P._ iv.), who explored this part of the city in 1550, does not mention any Byzantine church that answers at all to Gerlach's description of the church of Aetius, unless it be the Chora. That Gyllius should have overlooked so beautiful a monument of Byzantine days as the church of Aetius, if different from the Chora, is certainly very strange. But it is not less strange to find that Gerlach does not speak of the Chora. Can the difficulty thus presented be removed by the supposition that Gerlach refers to the Chora under the name of Aetius? The position he assigns to the church of Aetius in relation to the church of S. John in Petra and to the palace of Constantine (Tekfour Serai) favours that view, for he places the church of Aetius between S. John and the palace, exactly where the Chora would stand in that series of buildings. Looking towards the north-west from the windows of a house a little to the east of the Pammakaristos, Gerlach says 'Ad Occasum, Boream versus, Prodromi [Greek: monê] est, olim [Greek: petra]; longius inde, Aetii [Greek: monê]; postea, Palatium Constantini' (_Turcograecia_, p. 190). On the other hand, Gerlach's description of the church of Aetius differs in