Kun-dgav-rgyal-mtshan, chief of the Sa-skya-pa Sect
Kun-dgav-rgyal-mtshan was the forth forefather of the Sa-skya-pa Sect of Tibetan Buddhism as well as a renowned religious politician and scholar in history of Tibet. He was knowledgeable and proficient in Five Kinds of Greater Knowledge, so he was respectfully called "Sa-pan Pandit" (abbreviated as Sa-pan, meaning a great scholar of the Sa-skya-pa Sect). In 1246 A.D., he led his nephew Phyag-na-rdo-rje to Liangzhou to meet with Go-ldan, coming to terms regarding Tibet's submission to the Mongols. In 1247 A.D., he wrote a letter to Tibetan religious and secular chiefs in dBus-gtsang, persuading them to submit to the Mongols. This letter was welcomed and observed by them, and it played an important role in the incorporation of Tibet into the territory of China as well as the unification of Tibet by the Yuan Dynasty.

The letter written by Kun-dgav-rgyal-mtshan to Tibetan religious and secular chiefs. It is also called Sa-pan's letter to Tibetans.

Order issued by Kun-dgav-rgyal-mtshan to officials of dBus-gtsang Pacification Commissions