In the weakness into which they had fallen, it is not to be wondered that the survivors of the Latin conquerors were easily vanquished by the advancing power of the Greeks, and on July 25th, 1261, John Ducas and Michael Palæologus were welcomed back by the exultant Greeks to the throne of the Cæsars.

It was Alexius Strategopoulos, General and Cæsar, who captured the city. By night he led his men to the gate of the Pegè (πύλη τῆς πηγῆς)—the gate which led out to the spring of Balukli, now called the gate of Selivria. The Latins had built up the entrance, but some of the soldiers scaled the walls, and aided by friends within, killed the guards, broke down the barricade, and opened the gate. A few days later the Emperor, Michael Palæologus, entered in triumph. He walked as far as the church of S. John of the Studium. Then he mounted his horse and rode on to S. Sophia. So the Greeks had won back their city. But the results of the Latin conquest and the years of strife that followed it were not undone. The historian of that conquest has thus summed them up.

"The results of the Fourth Crusade upon European civilisation were altogether disastrous. The light of Greek civilisation, which Byzantium had kept burning for nearly nine centuries after Constantine had chosen it as his capital, was suddenly extinguished. The hardness, the narrowness and the Hebraicism of western civilisation were left to develop themselves with little admixture from the joyousness and the beauty of Greek life. Every one knows that the Turkish conquest of Constantinople dispersed throughout the West a knowledge of Greek literature, and that such knowledge contributed largely to the bringing about of the Reformation and of modern ways of thought. One cannot but regret that the knowledge of Greek literature was so dearly bought. If the dispersion of a few Greeks, members of a conquered and therefore despised race, but yet carrying their precious manuscripts and knowledge among hostile peoples, could produce so important a result, what effect might not reasonably have been hoped for if the great crime against which Innocent protested had not been committed? Western Europe saw the sparks of learning dispersed among its people. The light which had been continuously burning in a never forgotten and, among the literary class, a scarcely changed language, had been put out. The crime of the Fourth Crusade handed over Constantinople and the Balkan peninsula to six centuries of barbarism, and rendered futile the attempts of Innocent and subsequent statesmen to recover Syria and Asia Minor to Christendom and civilisation. If we would understand the full significance of the Latin conquest of Constantinople, we must try to realise what might now be the civilisation of Western Europe if the Romania of six centuries ago had not been destroyed. One may picture not only the Black Sea, the Bosphorus, and the Marmora surrounded by progressive and civilised nations, but even the eastern and southern shores of the Mediterranean given back again to good government and a religion which is not a barrier to civilisation."[25]

The restored Empire of the Greeks was ruled for some years with wisdom and enthusiasm. Michael Palæologus was of an ancient family already allied with the imperial house, and "in his person the splendour of birth was dignified by the merit of the soldier and statesman." He was admitted as the guardian, and then as the colleague, of the child-Emperor John. The gallant Varangians, the northern soldiers whose force had been replenished by fresh blood from year to year, and had never deserted the imperial house, had raised him to the throne, and he ruled with a severity and determination that bore down all opposition.

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."

Of his intrigues, the most important of which was his encouragement of the revolt of John of Procida against the French in Sicily, ever memorable as the Sicilian Vespers, it can only be said that they may have saved him from attack. Catalan mercenaries, who after the expulsion of the French from Sicily came into the service of the Empire, overwhelmed its fairest provinces with rapine and disaster. It is a history which makes Gibbon for once ascend the pulpit of the preacher of righteousness. "I shall not, I trust, be accused of superstition; but I must remark that, even in this world, the natural order of events will sometimes assume the strong appearances of moral retribution. The first Palæologus had saved his Empire by involving the kingdoms of the West in rebellion and blood; and from these seeds of discord uprose a generation of iron men, who assaulted and endangered the Empire of his son."

Andronicus II., indeed, had a long but disastrous reign. He continued his father's works at the harbour of the Kontoscalion. He repaired the sea walls, and in 1317, when his wife, Irene, died and left him some money, the impoverished Cæsar was able to undertake a general repair of the whole of the fortifications. Otherwise he is known in the history of the city only for his disputes with the patriarch, his abject submissions, and his misfortunes. His son, Michael IX., was from 1295 to 1320 the associate of his throne, and won universal praise. His grandson, Andronicus III., sank to the pleasures which had disgraced so many of his predecessors, but when his iniquities were too flagrant to be concealed, when his brother Manuel was murdered, it was believed, through his orders, and his father, Michael IX., died of grief, he took up arms against his grandfather, secured his own coronation, and then the absolute submission of the aged Emperor. Andronicus lived in 1332 in the great palace, but in absolute penury. He took monastic vows and died, no longer as Emperor, but as the poor monk Antony.

Andronicus the younger (III.), though he married princesses of Western houses, did not add to the dignity of the Eastern Empire. He died in 1341, and left behind him a child of eight, the son of his second wife, Agnes of Savoy. He was protected by John Cantacuzene, who had protected his father, and finally won him the crown, and who himself bore a character that was high among the best of the Byzantine statesmen and generals. But palace intrigues and attacks of interested politicians against him, at last obliged him, as he declares—for he is his own historian—to assume the Imperial title. In the war that ensued it seems that while the people supported the Palæologi, the officials supported the new claimant. It gave the opportunity to the Servian king, Stephen Dashan, to extend his territories and threaten to replace the Emperors as leaders of the Greek peoples. Strip by strip the territory of the Empire was shorn away, and Serbians, Turks, and Albanians left little to be conquered by Cantacuzene. At last, after previous failures, he advanced to the walls again in 1347 and was admitted secretly by his friends through the Golden Gate. For once, what was practically a change of dynasty was accomplished without bloodshed. John Cantacuzene became Emperor and gave his daughter in marriage to John Palæologus. It is said by a contemporary that so poor were even the imperial houses that at the wedding feast the illustrious personages had to be served in earthenware and pewter: strange change from the time when the very walls of the palace glittered with gold. In seven years the balance of power changed completely. War, first joint against the Serbians, then hostile against each other, was ended, it seemed, in favour of Cantacuzene by the assistance—a woeful precedent—of the Turks, now settled in Europe and the masters of Adrianople. But when the successful Emperor tried to associate his son Matthew on the throne, the feeling of Constantinople turned strongly against him. In 1358, John Palæologus whose seat of government had been fixed at Thessalonica, arrived, with but two galleys and two thousand men, on a dark night at the gate of the Hodegetria on the Sea of Marmora. Bringing their vessels quite close to the gate, they made every sign of distress, throwing out oil-jars and uttering cries for help. The stratagem succeeded; the guards opened the gate and came to their assistance. They were overpowered, and the troops rushed in and captured the adjoining tower. The city rose in favour of the young Palæologus, and John Cantacuzene with great willingness, if he is to be believed in his own case, retired from the throne and entered a monastery, where he died in 1383.

Each change of Emperor marked the more clearly the coming end of the Empire. John VI. Palæologus "carelessly watched the decline of the Empire for thirty-six years," from the day when he became sole ruler. He saw the growth of the Turkish power, and he sought the aid of Urban V. for the final contest that he saw must come. In 1361 he was decisively defeated before Adrianople, and in later years he was little better than the vassal of the Sultan. He himself went to Rome in 1369, and submitted to the Latin Church, on the points of the Procession of the Holy Spirit, the use of unleavened bread and the supremacy of the Roman See. So poor was he that he was arrested at Venice, on his return, for debt. The Cæsar of the East had indeed sunk low.