Mahomet died of apoplexy in 1421 at the early age of forty-seven. He was buried at Brusa in a mausoleum near to the splendid building known as the Green Mosque, which he had himself erected. VI MURAD II 1421-51 MURAD succeeded his father in the Sultanate as second of the name. He reigned for thirty years, including two short periods when he abdicated and retired into private life. But on each occasion he was compelled by the exigencies of the State, and the youth and inexperience of his son and successor, to resume the throne. He much resembled his father in vigour and capacity as a general and in his desire to act justly. At the very commencement of Murad’s reign the Greek Emperor Manuel, by an almost incredible act of folly, hoping to take advantage of Murad’s youth and inexperience, let loose from confinement a man who claimed, whether rightly or not was never clearly established, to be Mustapha, the son of Sultan Bayezid, who had disappeared after the battle of Angora. Manuel entered into a treaty with this claimant to the Ottoman throne, by which, in the event of his succeeding in establishing his succession, the city of Gallipoli and all the cities on the shores of the Black Sea, taken from the Greek Empire by the Turks, were to be restored to it. In spite of this scandalous treachery to Islam, the so-called Mustapha succeeded in raising a large army in Europe, with which he defeated the troops who adhered to Murad. He then crossed the Dardanelles into Asia with his army in vessels supplied by the Emperor Manuel. Murad showed all the vigour and capacity of his race in dealing with this emergency. He won over the greater part of Mustapha’s army, who were disaffected. He defeated what remained. Mustapha was driven across the Straits again to Gallipoli, where he was besieged, captured, and hanged, as the best proof, it was said, that he was an impostor.