From Rigpa Wiki
Songtsen Gampo (Tib. སྲོང་བཙན་སྒམ་པོ་, Wyl. srong btsan sgam po) (c.605-650) was the first of Tibet's three great religious kings and was an emanation of the bodhisattva Avalokiteshvara. It was during his reign that the first Buddhist temples in Tibet, the Rasa Trulnang (future Jokhang) and the Ramoche, were built. He married the Nepalese princess Bhrikuti and the Chinese princess Wencheng.
- Richardson, Hugh E. "How Old was Srong Brtsan Sgam Po" in Bulletin of Tibetology, 1965. 2.1. pp 5–8.