Murad, having won this great victory, again, a second time, abdicated his throne and returned to his retreat at Magnesia, and again the young Mahomet was invested as Sultan. Though history supplies cases of great kings seeking retirement from the cares of office, and of some of them being induced to resume their thrones, it records no other case of a second abdication and a second resumption. Murad was very soon recalled from his abode of pleasure. A serious outbreak of the Janissaries occurred at Adrianople. They ravaged the city and committed great atrocities. The ministers of the young Sultan were greatly alarmed. They felt that only a strong hand could keep a check on the unruly Janissaries. Murad was again summoned from his retreat. The young Mahomet was induced to go on a hunting expedition. In his absence Murad again made his appearance at Adrianople and resumed power. Mahomet, on his return from hunting, found that his father was again in the saddle. Murad was received by his troops with a great ovation, and even the unruly Janissaries gave in their submission to him. He did not again seek retirement at Magnesia. He reigned for seven more years—another period of almost incessant war. He first made an invasion of the Morea, which the Greek Emperor’s brothers had divided between them and governed as petty princes, or despots, as they were called. Murad had no difficulty in storming and capturing the fortification by which the isthmus of Corinth was defended. He compelled the two despots to accept the position of vassals under the Empire. Murad then again turned his attention to Serbia and Hungary. He defeated the combined forces of Hungary, Serbia, and Bosnia, under Hunyadi, on the field of Kossova, where in 1389 Murad I had first subdued the Serbians. As a result of this great battle Serbia lost its independence and was finally incorporated as an integral part of the Ottoman Empire. Bosnia became a tributary State. Murad was less fortunate in his efforts to subdue the Albanians. These people were under the leadership of George Castriota—commonly called Scanderbeg—who had been brought up at Murad’s Court as a Mussulman, and had learned the art of war from him, but who had abjured Islam, with a view to leadership of the Albanians. He carried on a guerrilla war against the Ottoman invaders with great success, and Murad was unable to complete the conquest of the State. This was practically the only failure of Murad’s adventurous life. His generals met with many defeats at the hand of Hunyadi, but Murad retrieved them in the two battles in which he came in conflict with the great Hungarian hero. He died of apoplexy in 1451.