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Rattanakosin Siam

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Siamese Empire
จักรวรรดิสยาม
Cạkrwrrdi s̄yām
Flag of
Flag
of
Coat of arms
Motto: ชาติ ศาสนา พระมหากษัตริย์
Chat, Satsana, Phra Mahakasat
"Nation, Religion, King"
Anthem: Phleng Chat Thai
(English: "Thai National Anthem")
Royal anthem: Sansoen Phra Barami
(English: "Glorify His prestige")
Map of Siam.JPG
StatusEmpire
Capital
and
Bangkok
Official languagesThai
Recognised regional languagesKhmer, Lao, Vietnamese
Ethnic groups
Thais, Khmer, Lao, Vietnamese, Malays
GovernmentSemi-constitutional monarchy
• Emperor
Kraisee
Phraya Phahonphonphayuhasena
LegislatureNational Assembly
Senate
House of Representatives
Establishment
1238-1448
1351-1767
1768-1782
6 April 1782
• Empire
5 November 1918
• Current Constitution
20 January 1920
Area
• 
1,263,809 km2 (487,959 sq mi)