Sadnalegs

Mutik Tsenpo the 39th king of Tibet had several names: formally Tridé Tsenpo (Tibetan: ཁྲི་ལྡེ་སྲོང་བ, Wylie: Khri lde btsan po), and his nickname Sadnalegs (Tibetan: སད་ན་ལེགས, Wylie: sad na legs). He was the third and youngest son of King Trisong Detsen. He reigned between the disputed king of Tibet, Mune Tsenpo, and the 40th king, Ralpachen, making the dates of his reign from 800 to 815 CE.

After Trisong Detsen retired to live at Zungkar, he passed the throne to his second son, Muné Tsenpo, who reigned from in 797 to 799. It is said that Muné Tsenpo was poisoned by his mother.

Buton Rinchen Drub states that Muné Tsenpo's throne was passed to his brother Mutik Tsenpo, who was later "known by the surname of Sen-na-le (fn. 1351, Sadnalegs)."

Both the Chronicle of Ba, other Tibetan sources, and the Old Book of Tang agree that since Muné Tsenpo had no heirs, the throne passed to his younger brother, Mutik Tsenpo (Sadnalegs) in 800, and he was coronated by 804 CE.

Although Mutik Tsenpo was only four years of age, after the poisoning of Muné Tsenpo, the Buddhist monk Nyang Tingngezin proposed to enthrone Mutik Tsenpo as the king. He was so young that most of the ministers doubted his ability to be the king. In order to test the majesty of the young prince, the ministers let him sit on a seat and put many precious ornaments on his head. His body couldn't carry such a weight, so he tilted his neck and wobbled, which was considered very dignified. Finally he inherited the throne. Sadnalegs was assisted by four experienced ministers, two of whom were also Buddhist monks. They followed the policies of the previous kings. Sadnalegs had four wives from different Tibetan clans and five sons while the number of his daughters is unknown.