The Chinese Buddhist pilgrim Xuanzang visited the western Göktürk capital Suyab in modern Kyrgyzstan and left a description of the khagan. Scholars believe the khagan described by Xuanzang was Tong Yabghu.
The Chinese Buddhist traveler Xuanzang documented his encounter with the western Göktürk capital Suyab and left a description of the ruler, who is thought by experts to have been Tong Yabghu.