sentences:  After being released in 1428, Abu'l-Khayr began consolidating various nomadic groups of the old Shaybani "ulus" in the area around Tyumen and the Tura River.He deposed and killed Kazhy-Mohammed, the Khan of the Khanate of Sibir, after a battle on the Tobol River, after which he was proclaimed Khan of Western Siberia.The next four years were spent strengthening his control throughout the region.