Helmut F. Neumann and Heidi A. Neumann. Wall Paintings of the Dungkar Caves Three and Four: Iconography and Style
Tibet adopted Buddhism in a slow and halting process, at a time when the religion was already flourishing in the surrounding regions: Central Asia, China, Kashmir, Nepal, Bihar and Bengal. Buddhism was first officially introduced into Tibet in the 7th century in connection with an alliance that King Songtsen Gampo (609–49) forged with China and Nepal by marrying princesses from these countries. Starting from the areas close to the royal residence in the Yarlung valley, Buddhism slowly spread through the entire territory of Tibet, until the 9th century, when a revival of the indigenous Bön religion resulted in the persecution of Buddhism.