Princess Wencheng
Tongtsen was dispatched to Tang China together with Dri Seru Gungton and Thonmi Sambhota in 640, requesting a marriage between the Tibetan emperor and a Tang princess. Taizong, the Tang emperor, agreed and married Princess Wencheng to Songtsen Gampo. Taizong appreciated his talent and promoted him to "Right Guard Senior General" (), but was refused by him.