The Timurid state quickly split in half after the death of Timur. The chronic internal fighting of the Timurids attracted the attention of the Uzbek nomadic tribes living to the north of the Aral Sea. In 1501, the Uzbek forces began a wholesale invasion of Transoxiana. The slave trade in the Khanate of Bukhara became prominent and was firmly established. Before the arrival of the Russians, present Uzbekistan was divided between Emirate of Bukhara and khanates of Khiva and Kokand.