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.