Returning to the question of the identity of Cyrus with the Prefect Constantine above mentioned, the strongest argument in favour of that identity is the fact that, commencing with Theophanes, who flourished in the latter part of the eighth century, all historians who refer to the fortification of the city under Theodosius II. ascribe the work to Cyrus. That they should be mistaken on this point, it may be urged, is extremely improbable. On this view, the occurrence of the name Constantine instead of Cyrus in the inscriptions and in Marcellinus Comes, is explained by the supposition that the former name was the one which Cyrus assumed, as usual under such circumstances, after his conversion to the Christian faith.[183] But surely any name which Cyrus acquired after his dismissal from office could not be employed as his designation in documents anterior to his fall. Perhaps a better explanation is that Cyrus always had both names, one used habitually, the other rarely, and that the latter appears in the inscriptions because more suited than the former to the versification in which they are cast. This, however, does not explain why Marcellinus Comes prefers the name Constantine. On the other hand, the proposed identification of Cyrus and Constantine is open to serious objections. In the first place, not till the eighth century is the name of Cyrus associated with the land walls of Constantinople. Earlier historians,[184] when speaking of Cyrus and extolling his services, say nothing as to his having been concerned in the fortification of the city in 447. In the next place, the information of Theophanes and his followers does not seem based upon a thorough investigation of the subject. These writers ignore the fact that under Theodosius II. the land walls were built on two occasions; they ascribe to Cyrus everything done in the fifth century in the way of enlarging and fortifying the capital, and are silent as regards the connection of the great Anthemius with that work. The only Byzantine author later than the fifth century who recalls the services of Anthemius is Nicephorus Callistus,[185] and even he represents Cyrus as the associate of that illustrious prefect. If such inaccuracies do not render the testimony of Theophanes and subsequent historians worthless, they certainly make one ask whether these writers were not misled by the great fame of Cyrus on the ground of other achievements, and especially on account of his share in building the walls along the shores of the city in 439, to ascribe to him a work which was really performed by the more obscure Constantine. The Inner Wall. Τὸ κάστρον τὸ μέγα:[186] Τὸ μέγα τεῖχος.[187]