Twelve years earlier Timur (known in the West as Tamerlane) had been a minor member of the Barlas tribe, one of many tribes in the western part of the Chagatai Khanate. Since the 1330s the Khanate had been split in two, between Mawarannahr (Transoxiana) in the west and Moghulistan in the east. Between 1347 and 1358 Mawarannahr was ruled by Amir Qazaghan, but in 1358 he was assassinated on the orders of Tughlugh Timur, Khan of Moghulistan.