sentences:  He was a descendant of Genghis Khan, through Jöchi's fifth son Shiban, and a bej of the White Horde.At the time of his birth the "ulus" (tribe) of Siban had divided into separate nomadic groups, one of which was led by Jumaduq Khan.Abu'l-Khayr served in Jumaduq's army, and was taken prisoner when Jumaduq was killed in battle in 1427.