Context: The history of a unified Tibet begins with the rule of Songtsän Gampo (604–650 CE), who united parts of the Yarlung River Valley and founded the Tibetan Empire. He also brought in many reforms, and Tibetan power spread rapidly, creating a large and powerful empire. It is traditionally considered that his first wife was the Princess of Nepal, Bhrikuti, and that she played a great role in the establishment of Buddhism in Tibet. In 640 he married Princess Wencheng, the niece of the powerful Chinese emperor Taizong of Tang China.

Question: Who founded the Tibetan Empire?
Answer: Songtsän Gampo

Question: Who did Songtsan Gampo marry in 640?
Answer: Princess Wencheng

Question: Who was Songtsan Gampo's first wife?
Answer: Princess of Nepal, Bhrikuti

Question: What did Songtsan Gampo unite?
Answer: parts of the Yarlung River Valley

Question: Who ruled Tibet from 640-650 CE?
Answer: Unanswerable

Question: What began in the period from 640 to 650 CE?
Answer: Unanswerable

Question: What empire did Gampo Songstan found?
Answer: Unanswerable

Question: Who was Princess Wencheng the first wife of?
Answer: Unanswerable

Question: Who was the Princess of Nepal the second wife of?
Answer: Unanswerable