In 1767, the Kingdom of Ayutthaya fell to the Burmese, and King Taksin then moved the capital to Thonburi where he built the old palace beside Wat Arun on the west bank of Chao Phraya River. In 1778, Taksin's army under the command of Chao Phraya Chakri (who later became Rama I) captured Vientiane and took the Emerald Buddha back to Thonburi.