Songtsen Gampo
Gampo's son, Gungsong Gungtsen, died before his father. So Gampo's son, Mangsong Mangtsen, took the throne. His mother may have been Wencheng or Mangmoje Trikar. Trikar is mentioned in Genealogy, in a hidden library in the caves in Dunhuang, and the Tibetan Annals, which list the names of the Tibetan emperors, their mothers, and their clans.