According to its place in the order of the gates, this entrance should be the Sixth Military Gate; and the smallness of its dimensions is in keeping with this view. But as it led to a Circus built of timber beside the Church of St. Mamas without the walls, it was styled Porta Xylokerkou (Ξυλοκέρκου),[[380]] Gate of the Wooden Circus, or more briefly, Kerko Porta (Κερκόπορτα),[[381]] the Gate of the Circus.
In support of this identification there is first the fact that the Gate of the Xylokerkus, like the gate before us, was an entrance in the Walls of Theodosius, for it bore an inscription, which has unfortunately disappeared, in honour of that emperor and the Prefect Constantine, similar to the legend on the Porta Rhegiou.[[382]] In the next place, the Gate of the Xylokerkus, like the entrance before us, was in the vicinity of the Gate of Charisius, and below a palace[[383]] (Tekfour Serai).
The (So-Called) Kerko Porta.
The history of the gate has an interest of its own. When the Emperor Frederick Barbarossa was at Philippopolis, on his way to the Holy Land at the head of the Third Crusade, the prevalent suspicion that he had designs upon the Byzantine Empire found expression in the prophecy of a certain Dositheos, a monk of the Monastery of St. John Studius, that the German emperor would capture Constantinople, and penetrate into the city through this entrance. Thereupon, with the view of averting the calamity and preventing the fulfilment of the prophecy, Isaac Angelus ordered the gate to be securely built up.[[384]] In 1346 the partisans of John Cantacuzene proposed to admit him into the city by breaking the gate open, after its long close.[[385]]
But what gives to the Kerko Porta its chief renown is the part which, according to Ducas, it played in the catastrophe of 1453, under the following circumstances. A large portion of the Outer Wall, at the Mesoteichion, having been overthrown by the Turkish cannon, the besieged were unable to issue from the city to the peribolos without being exposed to the enemy’s fire. In this extremity some old men, who knew the fortifications well, informed the emperor of a secret postern long closed up and buried underground, at the lower part of the palace, by which communication with the peribolos might be established.[[386]] This was done, to the great advantage of the Greeks. But on the last day of the siege, while the enemy was attempting to scale the walls with ladders at several points, a band of fifty Turkish nobles detected the newly opened entrance, rushed in, and mounting the walls from the interior of the city, killed or drove off the defenders on the summit. Thus a portion of the fortifications was secured against which scaling-ladders could be applied without any difficulty, and soon a considerable Turkish force stood on the Inner Wall, planted their standards on the towers, and opened a rear fire upon the Greeks, who were fighting in the peribolos to prevent the Turks from entering at the great breach. The cry rose that the city was taken, whereupon an indescribable panic seized the Greeks, already disheartened by the loss of Giustiniani, and, abandoning all further resistance, they fled into the city through the Gate of Charisius, many being trampled to death in the rout. The emperor fell at his post; and the Turks poured into the city without opposition.[[387]] The fate of Constantinople was thus scaled by the opening of the Kerko Porta.
But here a difficulty occurs. In one very important particular the Kerko Porta, as described by Ducas, does not correspond to the character of the entrance with which it has been identified. The gate which the historian had in mind led to the peribolos, the terrace between the two Theodosian walls, whereas the gate below Tekfour Serai opens on the parateichion, the terrace between the Outer Wall and the Moat. This discrepancy may, however, be removed to some extent by supposing that under the name of the Kerko Porta. Ducas referred to the postern which Dr. Paspates[[388]] found in the transverse wall built across the northern end of the peribolos, where the Inner Wall of Theodosius terminates abruptly a little to the south of Tekfour Serai. The postern was discovered in 1864, after some houses which concealed it from view had been destroyed by fire. It was 10-½ feet high by 6 feet wide, and although the old wall in which it stood has been, for the most part, pulled down and replaced by a new construction, the outline of the ancient postern can still be traced. Such an entrance might be buried out of sight, and be generally forgotten; and to open it, when recalled to mind in 1453, was to provide the defenders of the city with a secret passage, as they hoped, to the peribolos and the rear of the Outer Wall, where the contest was to be maintained to the bitter end.
The suggestion of Dr. Paspates that this was the entrance at which the incidents recorded by Ducas occurred may, therefore, be accepted. But, from the nature of the case, an entrance in such a position could not have been, strictly speaking, the Gate of the Circus, and to call it the Kerko Porta was therefore not perfectly accurate. That was, properly, the name of the gate below Tekfour Serai. Still, the mistake was not very serious, and, under the circumstances, was not strange. Two entrances so near each other could easily be confounded in the report of the events in the neighbourhood, especially when the postern in the transverse wall had no special name of its own. Dr. Mordtmann[[389]] thinks that the postern near the Kerko Porta was the one which Giustiniani, according to Critobulus,[[390]] opened in the Inner Wall to facilitate communication with the peribolos. The latter postern, however, is represented as near the position occupied by Giustiniani and the emperor, while the former is described as far from that point.[[391]]
CHAPTER VI.
REPAIRS ON THE THEODOSIAN WALLS.
The maintenance of the bulwarks of the city in proper order was naturally a matter of supreme importance, and although the task was sometimes neglected when no enemy threatened, it was, on the whole, attended to with the promptitude and fidelity which so vital a concern demanded. There was little occasion for repairs, it is true, on account of injuries sustained in the shock of war, for until the invention of gunpowder the engines employed in battering the walls were either not powerful enough, or could not be planted sufficiently near the fortifications, to produce much effect. Most of the damage done to the walls was due to the action of the weather, and, above all, to the violent and frequent earthquakes which shook Constantinople in the course of the Middle Ages.