General Chakri succeeded him in 1782 as Rama I, the first king of the Chakri dynasty. In the same year he founded the new capital city across the Chao Phraya river in an area known as Rattanakosin Island. (While settlements on both banks were commonly called Bangkok, both the Burney Treaty of 1826 and the Roberts Treaty of 1833 refer to the capital as the City of Sia-Yut'hia.[24]) In the 1790s, Burma was defeated and driven out of Siam, as it was then called. Lanna also became free of Burmese occupation, but was reduced to the Kingdom of Chiangmai: the king of the new dynasty was installed as a tributary ruler of the Chakri monarch.