Rattanakosin Siam

Siamese Empire จักรวรรดิสยาม Cạkrwrrdi s̄yām
Flag 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")
Status	Empire
Capital and	Bangkok
Official languages	Thai
Recognised regional languages	Khmer, Lao, Vietnamese
Ethnic groups	Thais, Khmer, Lao, Vietnamese, Malays
Government	Semi-constitutional monarchy
• Emperor	Kraisee
• Prime Minister	Phraya Phahonphonphayuhasena
Legislature	National Assembly
• Upper house	Senate
• Lower house	House of Representatives
Establishment
• Sukhotai Kingdom	1238-1448
• Ayutthaya Kingdom	1351-1767
• Thonburi Kingdom	1768-1782
• Rattanakosin Kingdom	6 April 1782
• Empire	5 November 1918
• Current Constitution	20 January 1920
Area
•	1,263,809 km2 (487,959 sq mi)