Hephthalite Empire
Having excelled both in battle and diplomacy, Bumin declared himself Illig Khagan of the new khanate at Otukan, but died a year later. His son, Muqan Qaghan, defeated the Hephthalite Empire, Khitan and Kyrgyz. Bumin's brother Istämi (d. 576) bore the title "Yabgu of the West" and collaborated with the Sassanid Empire of Iran to defeat and destroy the Hephthalites, who were allies of the Rouran. This war tightened the Ashina clan's grip on the Silk Road.