Tong Yabghu Qaghan

Tong Yabghu Qaghan (r. 618–628 or 630) was the qaghan of the Western Turkic Khaganate from 618 to 628. Tong Yabghu was the brother of Shikui Khagan (r. 611–618), the previous qaghan of the western Göktürks, and was a member of the Ashina clan; his reign is generally regarded as the zenith of the Western Turkic Khaganate. He is usually identified same as Ziebel, first Qaghan of Khazars.