Second to the Chanyu in power were the Tuqi Kings; the Tuqi Kings are also called the "Wise Kings", where the Xiongnu word for "Tuqi" means "Wise" (Lewis 2007, 131). Lewis, Mark Edward (2007). The Early Chinese Empires: Qin and Han. Cambridge: Harvard University Press. ISBN978-0-674-02477-9.
The translation given by Lewis (2007, 137) states: "Your servant humbly thinks back on how since his ancestor submitted to the Han we have been blessed with your support, keeping a sharp watch on the passes and providing strong armies for more than forty years. Your subjects have been born and reared in Han territory and have depended entirely on the Han for food. Each year we received gifts counted in the hundreds of millions [of cash]." Lewis, Mark Edward (2007). The Early Chinese Empires: Qin and Han. Cambridge: Harvard University Press. ISBN978-0-674-02477-9.