Although the capture of Constantinople was the principal feat in Mahomet’s long reign, and that on which his fame in history chiefly rests, it was, in fact, only the first of a long list of conquests which earned for him from his countrymen the title _par éminence_ of ‘the Conqueror.’ During the thirty years of his reign he was almost always at war in personal command of his armies, and there were very few in which he did not add fresh territory to his Empire, either in Europe or Asia. Bosnia and the Morea, which had become tributary States under previous Sultans, were now again invaded and were compelled to become integral parts of the Empire. Their princes were dethroned and put to death. Wallachia and the Crimea were forced to become vassal States. In Asia, Karamania, so long the rival and foe of the Ottomans, and which, after many wars, had agreed to pay tribute, was now forcibly annexed, and its Seljukian line of kings was put an end to by death. The great city of Trebizond and its adjoining province of Cappadocia, which had been cut off from the parent Empire, after the capture of Constantinople by the Crusaders, and formed into a miniature Empire, under the Comneni dynasty, was invaded and annexed by Mahomet, and at his instance its reigning family was put to death. The possessions of the Genoese on the coasts of the Black Sea were seized and appropriated. Many islands in the Greek Archipelago, including Lesbos, Lemnos, and Cephalonia, were also attacked and annexed. The same fate befell Eubœa. It belonged to the Republic of Venice, which was also deprived of others of its possessions on the coast of the Morea. Besides all these enterprises, Mahomet in several successive years sent armies to ravage parts of Styria and Transylvania. He even sent an army across the frontier of Italy to ravage the region of Friuli, and other districts almost within sight of Venice, whose Republic was compelled to enter into an ignominious treaty, binding it to assist the Ottomans in other wars with a naval force. The last achievement of the ambitious Sultan was to send a force to the South of Italy, where it captured Otranto. The only captures which Mahomet attempted without success were those of Belgrade, in 1456, and the island of Rhodes in 1480. The case of Belgrade was of the greatest importance, for it long barred the way to the invasion of Hungary and Germany. The Sultan himself took command of the army of attack with a hundred and fifty thousand men and three hundred guns. He thought the capture of it would be an easy task after that of Constantinople. But Western Europe, which had rendered so little assistance to the Greek Empire in its extremities, was alarmed at the prospect of the invasion of Germany through the loss of Belgrade. The Pope preached another crusade, and a large body of knights volunteered for the defence of this frontier city.