It was his first task to cleanse and restore the palace of Blachernae, left filthy and dilapidated by Baldwin II. Then he set about the restoration of the walls. His chief attention was paid to the sea walls, which he raised seven feet by means of wooden erections covered with hide; and later he began to make a double line of walls to protect the sea side of the city as the land side was protected. He took the harbour of the Kontoscalion (in front of what is now Koum Kapoussi) for a dockyard, had it dredged and deepened, protected by an iron mole and "surrounded with immense blocks, closed with iron gates." But he was determined to rule alone, and before the end of the year he had blinded his young colleague and banished him. He was excommunicated by the patriarch Arsenius, and a schism was caused by his banishment of the prelate, which was not healed for nearly fifty years. Fearing a renewed invasion by the Latins he did his utmost to make alliances to protect himself. He established the Genoese in a settled concession at Galata, hoping to make them a firm support against their rivals of Venice. But this act only made the commercial rivalries stronger, and planted a power which soon became hostile on the very shores of the capital and in command of the Golden Horn. "The Roman Empire," says Gibbon, "might soon have sunk into a province of Genoa, if the Republic had not been checked by the ruin of her freedom and naval power." No less disastrous was the attempt of Michael to unite with the Roman Church. Urban IV. had taken up the cause of the young Baldwin and called on the powers to make Crusade. Michael endeavoured to meet him by diplomacy if not by submission. His envoys attended the council held at Lyons in 1274 by the Pope Gregory X. Veccus, who had long opposed the union of the churches, underwent a sharp imprisonment in the prison of Anemas, but being convinced of the error of his opinions was released to mount the patriarchal throne. But all these measures were in vain. On questions of faith it should not have been impossible for candid men, as the history of Veccus shows, to bring the churches into essential union, but the claim of the Popes to supremacy, which they emphasised by the mission of legates, was one which the Church of Constantinople has never admitted. Michael died in 1282. Already his attempt had failed, and he died excommunicated by pope and patriarch. The restorer of the Empire was unworthy to rank among its heroes, and the historian of the Greek people has described him in language of severity that is well deserved. "He was selfish, hypocritical, able and accomplished, an inborn liar, vain, meddling, ambitious, cruel and rapacious. He has gained renown as the restorer of the Eastern Empire; he ought to be execrated as the corrupter of the Greek race, for his reign affords a signal example of the extent to which a nation may be degraded by the misconduct of its sovereign when he is entrusted with despotic power."