He kept on the best of terms with the Greek Emperor, with whom he had made a defensive alliance, and restored to him certain cities on the coast of the Black Sea and in Thessaly. He had frequent causes, however, for the use of his army, and for showing his skill as a general. He compelled the Emirs of Karamania, Kermia, and other principalities in Asia Minor, who had promised allegiance to Timur, to renew their vassalage to the Ottoman Empire. Two or three times the Karamanian prince revolted and endeavoured to assert complete independence. As often Mahomet defeated him, but contented himself with asserting supremacy, and did not insist upon the incorporation of his territory with the Empire. He also defeated an attempt of a Turkish upstart to create an independent State at Smyrna and Aidin. He put down a dangerous revolt of Dervishes and extinguished the sect. He came into conflict at sea with the Republic of Venice, and though he was worsted, and his fleet of galleys was destroyed, he succeeded in making an honourable peace. As a ruler of his Empire he showed many great qualities. He gained the appellation which is best translated into English as the “Great Gentleman”—and right well he deserved it. He was magnanimous and just. He strictly observed his promises. He knew that his Empire could not be maintained by force alone, but that justice and clemency were necessary. His Christian subjects were everywhere treated with consideration. He would not tolerate cruelty to them. He was a liberal patron of literature, and in his short reign the Ottomans first showed a bent for poetry. It was a blot on his fame that he caused his youngest brother to be deprived of his sight, and that he put to death his nephew, the son of Solyman, lest either of them should dispute the throne with himself or his son after him. His experience of his brothers and the history of his family doubtless convinced him that no member of the Othman race would be content with any position short of the Sultanate. This may not be a moral justification, but it is an explanation which, in view of the ethics of the times, must prevent too severe a judgment. Though Mahomet in his short reign, after attaining full command of the Empire, made no extension of it, he must be regarded practically as one of its founders and as among its most eminent and successful rulers. He owed his success over his brothers to his moral ascendancy and to the great reputation which he achieved with his troops for his high qualities as a ruler even more than to his prowess as a general. The emergence of the Empire from the extreme difficulties into which it fell from the Mongolian invasion must have been due to the fact that the Ottomans at that time were much superior to the Greeks and the other Christian communities in all the qualities which tend to make a stable government.