 Tong Yabghu appointed governors or tuduns to manage the various tribes and people under his overlordship. In all likelihood Tong Yabghu's nephew Böri Shad, and son of Zibil / Ziebel was the commander of the Khazars, the westernmost of the tribes owing allegiance to the Western Göktürks; this branch of the family may have provided the Khazars with their first khagans in the mid seventh century.
