Phra Phutthayotfa Chulalok , born Thongduang and also known as Rama I (20 March 1737 – 7 September 1809), was the founder and the first monarch of the reigning House of Chakri of Siam (now Thailand). His full title in Thai is Phra Bat Somdet Phra Paramoruracha Mahachakkriborommanat Phra Phutthayotfa Chulalok . He ascended the throne in 1782, after defeating a rebellion which had deposed King Taksin of Thonburi. He was also celebrated as the founder of Rattanakosin (now Bangkok) as the new capital of the reunited kingdom.