Rattanakosin

After Taksin's death, General Chakri (Rama I) became the first king of the Chakri Dynasty, ruling from 1782 to 1809. His first action as king was to transfer the royal capital across the river from Thon Buri to Bangkok and build the Grand Palace. Rama II (1809-1824) continued the restoration begun by his predecessor. King Nang Klao, Rama III (1824-1851) reopened relations with Western nations and established trade with China.
King Mongkut, Rama IV, (1851-1868) may have achieved western fame through the story "The King and I", but won the hearts of Thais for his accomplishments including the establishment of treaties with European countries, thus avoiding colonialization, and modernizing Thailand through many social and economic reforms. King Chulalongkorn, Rama V (1869-1910) continued his father's tradition of reform, abolishing slavery and improving the public welfare and administrative systems.
Educational reforms, including compulsory education, were introduced by King Vajiravudh, Rama VI (1910-1925). During the reign of King Prajadhipok, Rama VII (1925-1935), Thailand changed from an absolute monarchy to a constitutional monarchy. The king abdicated in 1933 and was succeeded by his nephew, King Ananda Mahidol Rama VIII (1935-1946). The country's name was changed from Siam to Thailand with the advent of a democratic government in 1939. Our current monarch, King Bhumibol Adulyadej (R. Jun. 9, 1946 - present), is King Rama IX of the Chakri Dynasty.