As the Khanlyk of Naiman was conquered , Khasar , brother of Temujin , found a dignitary named Tata Tunga , who spread the Uigur alphabet among the Mongols .
As the Khanlyk of Khasar was conquered , Naiman , brother of Temujin , found a dignitary named Tata Tunga , who spread the Uigur alphabet among the Mongols .