Some authorities[961] have identified the entrance with the Sidhera Porta (the Iron Gate), which stood on this side of the city. But this is a mistake. The Iron Gate opened on the Harbour of Sophia,[962] and was near the Church of St. Thomas Amantiou;[963] and both these points were to the west of Tchatlady Kapou. Therefore Tchatlady Kapou itself cannot have been the Iron Gate. That the Harbour of Sophia lay in that direction is unquestionable, for it stood at Kadriga Limani,[964] which is to the west of Tchatlady Kapou. And that the same was true of the Church of St. Thomas is clear from the fact that this sanctuary and the Church of SS. Sergius and Bacchus marked, respectively, the western and eastern limits of the ravages made beside the Sea of Marmora, by the great fire in the reign of Leo I.[965] The Church of St. Thomas lay, therefore, to the west of SS. Sergius and Bacchus, and, consequently, as the latter stands to the west of Tchatlady Kapou, the former, also, must have occupied a similar position. [Illustration: Portion of Walls Beside the Sea of Marmora.] In the city walls, a little to the west of Tchatlady Kapou, opposite the beautiful Church of SS. Sergius and Bacchus, is a small postern, opened, doubtless, for the use of the monastery attached to that church. Its side-posts are shafts of marble, covered with a remarkable inscription, and were evidently brought from some other building, when the postern was constructed or repaired. The inscription is a cento of verses, taken, with slight modifications, from the Prophet Habakkuk and the Psalter, to form a pæan in honour of the triumph of some emperor over his foes. ΕΠΙΒΗΣΙ ΕΠΙ ΤΟΥΣ ΙΠΠΟΥΣ ΣΟΥ Κ. Η ΙΠΠΑΣΙΑ ΣΟΥ ΣΩ [ΤΗΡ] ΙΑ :[966] ΟΤΙ Ο ΒΑΣΙΛΕΥΣ ΗΜΩΝ ΕΛΠΙΖΙ ΕΠΙ ΚΝ. ΕΝ ΤΩ ΕΛΕΙ ΤΟ [Υ ΥΨΙΣΤΟΥ ΟΥ ΜΗ] SALEUΘΗ :[967] ΟΥΚ ΟΦΕΛΗΣΙ ΕΚΘΡΟΣ ΕΝ ΑΥΤΩ Κ. ΥΙΟΣ ΑΝΟΜΙΑΣ ΟΥ ΠΡΟΣΘΗΣΗ ΤΟΥ ΚΑΚΩΣΙ ΕΑΥΤΟΝ :[968] ΑΙΝΩΝ ΕΠΙΚΑΛΙΣΕΤΟ [ΚΝ.] : ΕΚ ΤΩΝ ΕΚΘΡΩΝ ΑΥΤΟΥ ΣΩΘΗΣΕΤΕ :[969] ΕΞΟΥΔΕΝΩΤΕ ΕΝΩΠΙΟΝ ΑΥΤΟΥ ΠΟΝΗΡΕΥΟΜΕΝΟΣ, ΤΟΥΣ ΔΕ ΦΟΒΟΥ [ΜΕΝΟΥΣ ΚΝ.] ΔΟΞΑΣΙ.[970] The next entrance, the Gate of Sophia (Πόρτα τῶν Σοφιῶν),[971] as its name implies, was attached to the Harbour of Sophia. It was known also as the Porta Sidhera (Πόρτα Σιδηρᾶ),[972] from the material of its construction, and after the Turkish Conquest was designated Porta Katerga Limani,[973] the Gate of the Harbour of the Galleys, from κάτεργον, the Greek word for a galley. The Porta Kontoscalion (τὸ δὲ λεγόμενον Κοντοσκάλιον ἡ Πόρτα)[974] communicated with the Harbour of the Kontoscalion,[975] and stood at Koum Kapoussi. Next follows the gate Yeni Kapou, in the quarter of Vlanga. The Latin inscription which was found over the gate[976] proves it to have been a Byzantine entrance, but its ancient name has not been preserved. The gate was beside the Harbour of Theodosius, or Eleutherius[977] (Vlanga Bostan). Its Turkish name must allude to repairs made after 1453.