His attention was now turned towards Khorāsān, which was in the hands of Husayn Mīrzā, also called Sultan Husayn Baykara, a descendant of Tīmūr’s second son, `Omar Shaykh. In A.H. 912 (1506) Bāber, hearing of the Uzbeg designs, marched northwards from Kābul to assist his relatives.[433] But in the interval Mīrzā Husayn died, and Bāber, on his arrival in Khorāsān, A.H. 913 (1507), found that the two sons of the late prince had instituted a dual government. So disgusted was he with their lack of definite policy and their mutual recriminations, that he returned to Kābul and left them to fight their own battles. In this year Shaybānī Khān, entering Khorāsān, defeated these ill-assorted colleagues and made himself master of the country. The next three years were passed in successful expeditions in the direction of Khorāsān and India, and against the Kazāks. But in A.H. 916 (1510) his career of conquest was brought to a sudden close. Shāh Isma`īl, the Safavī,--who eight years previously had overthrown the Turkoman dynasty of the “White Sheep” in Āzerbāyjān, and had set upon the conquest of all Persia,--now marched into Khorāsān. Here he defeated and slew Shaybānī Khān in the vicinity of Merv, thereby making himself master of the whole country.[434] For two years, from A.H. 916 to 918 (1510 to 1512) Transoxiana practically passed out of the hands of the Uzbeg Sultans. At all events, we find no coin of theirs during that period, though Persian historians aver that Shaybānī Khān was succeeded in the chief Khānate by Kuchunji. The nobles were probably too much occupied in providing for their own safety, after the disaster of Merv, to give consideration to the choice of a new chief.[435]