After a time the Emperor fretted under this position of vassalage, and in 1369 he went on a mission to Rome, in the hope of inducing the Pope to stir up the Christian Powers of Europe to another crusade against the Ottomans. He left his eldest son, Andronicus, in charge of the government at Constantinople during his absence. Arriving at Rome, he submitted to the most humiliating conditions with the object of gaining the support of the Pope Urban V. He abjured at St. Peter’s, before the High Altar, the principles of the Greek Church, so far as they differed from those of Rome. He admitted the ecclesiastical supremacy of the Pope. He was then permitted to bend his knee, and to kiss the Pope’s feet and hands. He was privileged also to lead the Pope’s mule by the bridle. He obtained, however, no return for these abject humiliations. The Pope was unable to induce the Christian Powers again to take up arms against the Ottomans.
The Emperor’s concessions to the Pope were also disavowed by the Hierarchs of the Greek Church at Constantinople. There never was any prospect of a reunion of the two Churches. The Emperor, John Palæologus, embarked on his homeward journey having nothing to show for his pains. On his way back, when passing through Venice, he was arrested, at the instance of his Venetian creditors, who had lent him money to defray the cost of his mission. Not having the means to pay, he could not discharge the legal process. Andronicus had no wish that his father should ever return to Constantinople. He made no effort to raise money for the release of the Emperor. He pleaded the poverty of the Treasury. A younger son, Manuel, however, with more filial piety, raised the necessary sum, by selling all his property, and obtained the release of his father. Shortly after his return to Constantinople the Emperor, as was to be expected, deprived Andronicus of all his appointments, and replaced him by Manuel, whom he also made co-Emperor with himself.
The son of Andronicus, of the same name, furious at this treatment of his father, entered into a mad conspiracy with Saoudji, the youngest son of Sultan Murad, with the object of dethroning both Emperor and Sultan and reigning in their place. Saoudji, being in command of the Sultan’s army in Europe, during the absence of Murad in Asia, was able to tamper with the loyalty of the Ottoman troops. He assembled a considerable force in the neighbourhood of Constantinople, where he was joined by a large number of the sons of Greek nobles and by many soldiers.
Murad, when he heard, at Brusa, of this mad outbreak, returned with all haste to Europe, and organized resistance to it, in concert with the Greek Emperor. They agreed that the two rebels, when captured, should be deprived of their eyesight. Murad thereupon, taking what soldiers he could get together, marched to meet Saoudji’s army. When within hearing of it, he called out to the soldiers by night, urging them to return to their duty and promising pardon to them. The soldiers, hearing the voice of the Sultan, who had so often led them to victory, repented of their treachery and deserted the cause which they had so foolishly taken up. Saoudji and Andronicus and the band of Greek nobles, thus deserted by the rank and file of the army, took refuge in the fortress of Demotika. Murad had no difficulty in capturing this place, and with it the two rebel princes and the Greek nobles. In pursuance of his agreement with the Emperor, he then deprived his own son of his eyesight and, going beyond his promise, had the young man executed. He caused the Greek nobles to be bound, two and three together, and thrown into the Maritza, while he stood on the bank and revelled in the sight of their drowning struggles. In some cases he insisted on parents themselves putting their sons to death in his presence. When they refused, the parents were drowned in the river together with their sons. In this instance Murad showed that he had in him the vein of cruelty which was conspicuous, more or less, in all the descendants of Othman. Andronicus was handed over to the Greek Emperor, who partially, but not completely, carried out his promise of depriving his grandson of eyesight.
As a result of these events, the Emperor John Palæologus found himself compelled to enter into another treaty with Murad, by which, in order “that he might enjoy up to the end of his life in peace his last possession,” he recognized himself as vassal of the Sultan, promised to do military service in the Ottoman army, and gave his son Manuel in charge of Murad as a hostage.
2. The Conquests in Macedonia, Bulgaria, and Serbia.
The conquest of Thrace by the Ottomans and the defeat of the allied Christians at the Maritza were as great blows to the Bulgarians as to the Greek Empire, though they had given no assistance to the allies. The occupation of Adrianople and Philippopolis opened the way to a further advance into Bulgaria and Macedonia. It was not, however, till 1366 that Murad availed himself of this advantage, and commenced the series of attacks which ultimately made him master of Macedonia and of a great part of Bulgaria and Serbia. The position of affairs in the peninsula at this time was very favourable to him. The Bulgarians, Serbians, Bosnians, and Greeks were madly jealous of one another; each of them preferred the extension of the Ottoman rule to that of their rivals. Bulgaria alone, if united, might have successfully resisted Murad. But in 1365 its Czar, Alexander, died, and his kingdom was divided between his three sons. Sisman, the elder, got the largest share. The other two gave no assistance to their brother when the Ottomans invaded his country. Between 1366 and 1369, Murad advanced into Bulgaria, and took possession of the Maritza Valley, as far as the Rhodope Mountains. In 1371 Lalashahin encountered an army of Bulgarians and Serbians at Samakof, not far from the city of Sofia, and completely defeated it, with the result that Bulgaria, up to the Balkan range, was annexed to the Ottoman Empire. It remained so for over five hundred years, till its release in our own times.
After this great victory at Samakof, Lalashahin was instructed by Murad not to pursue his conquest of Bulgaria north of the Balkan range, but to proceed westward, and, in concert with Evrenos, to invade Macedonia as far as the River Vardar. This occupied the two generals in the years 1371-2. Kavalla, Druma, and Serres fell into their hands. In 1372 they crossed the Vardar River and penetrated into Old Serbia, Albania, and Bosnia. The main part of Serbia, however, remained in the hands of Lazar, its prince. But he was compelled to acknowledge the suzerainty of the Sultan. As regards the part of Bulgaria not annexed, its prince, Sisman, was allowed to retain his independence. His daughter entered the harem of Murad, with the understanding that she was not to be compelled to adopt the Moslem religion. It was not till 1381 that a further advance was made by Murad. He then sent his armies across the Vardar River and captured Monastir. He also took possession of Sofia, and in 1386 of Nisch, after a fierce struggle with the Serbians.