Boworn Maha Surasinghanat (Thai: สมเด็จกรมพระราชวังบวร มหาสุรสิงหนาท) was the first Vice-King of the Bangkok era of Thailand. He was the younger brother of King Rama I. He is the great warrior of King Taksin and King Rama I. His birth name is Bunmaa. Ouparath, also Ouparaja, or Uparaja, are titles for viceregal positions reserved for of the Buddhist dynasties in Laos, Siam, Burma and Cambodia, as well as some minor tributary kingdoms of these. ... His Majesty King Rama I of Siam (portrait in the National History Museum, Bangkok) Buddha Yodfa Chulaloke or Rama I the Great, was king of Thailand from 1782 to 1809. ... Statue in Wat Welurachin, Thonburi Taksin the Great (Thai: ตากสินมหาราช; 鄭昭; pinyin: Zhèng Chāo; April 17, 1734 - April 7, 1782) was king of Thailand from 1767-1782. ... His Majesty King Rama I of Siam (portrait in the National History Museum, Bangkok) Buddha Yodfa Chulaloke or Rama I the Great, was king of Thailand from 1782 to 1809. ...