The other gives the date †ϚΤΛ† (822), which belonged to the sole reign of the former emperor. These repairs were probably made when Thomas, the rival of Michael for the throne, attacked the fortifications in this quarter. It was precisely in the year 822 that the rebel general encamped beside the Monastery of SS. Cosmas and Damianus (above Eyoub), and then, armed with battering-rams and scaling-ladders, advanced to the assault of the towers of Blachernæ, behind which the standard of Michael floated over the Church of the Theotokos.[570] The tower at the north-western corner of the enclosure was reconstructed by the Emperor Romanus, as an inscription upon it proclaims: [Illustration: “The Tower of St. Nicholas was restored from the foundations, under Romanus, the Christ-loving Sovereign.”] To which of the four emperors named Romanus the work should be assigned is not easy to decide. The tower must have derived its name from the Church of S. Nicholas in this vicinity, for the site of that church is marked by the Holy Well which still flows amid the graves and trees of the Turkish cemetery within the Brachionion of Blachernæ, an object of veneration alike to Moslems and orthodox Greeks. The grounds on which the opinion rests are that, previous to the erection of the Heraclian Wall, the church is described as without the city bounds, in the district of Blachernæ;[571] while after the erection of Leo’s Wall it is spoken of as within the city limits, and close to the gate by which persons proceeded from the Blachernæ quarter to the Cosmidion.[572] This is exactly how a building beside the Holy Well between the two walls, and near the Gate of Blachernæ which pierces them, would be described under such circumstances. The proximity of these walls to the Palace of Blachernæ, as well as their comparative weakness, combined to make them the scene of many historical events. While the Wall of Heraclius stood alone, it was through the Gate of Blachernæ that Apsimarus was admitted by his adherents, in 698, to supplant Leontius;[573] by the same entrance Justinian II., in 705, attempted to force his way into the city to dethrone Apsimarus;[574] and through it, again, Theodosius III., in 716, entered and deposed Anastasius II.[575] It was before the Heraclian Wall that Crum and Leo the Armenian met to confer, under the circumstances already narrated.