 |
|
| c252 BC | Buddhism first brought to Suvannabhumi ("Golden Land" - probably centred around today's Nakhon Pathom area) by Indian King Asoka's missionaries | |
| c550 | Dvaravati civilization of Buddhist ethnic Mon people in central and northeastern Thailand until the 9th century | |
| c1000 | Ethnic Tai peoples moving down from southern China; Angkorean empire in control in 11th and 12th centuries, bringing Brahmanism, Mahayana Buddhism, Sanskrit words and the Khmer-based royal vocabulary still in use today | |
| 1238 | Ethnic Tai Sukhothai kingdom established by King Sri Indraditya | |
| 1259 | King Mangrai first ruler of ethnic Tai kingdom of Lanna | |
| 1279 | Accession of King Ramkhamhaeng of Sukhothai | |
| 1292 | Ramkhamhaeng's inscription describing his kingdom | |
| 1345 | Compilation of the influential Buddhist text Triphum Phra Ruang (Three Worlds Cosmography) by King Lithai of Sukhothai | |
| 1351 | Legendary foundation of Ayutthaya | |
| 1569 | First fall of Ayutthaya to the Burmese | |
| 1656 | Accession of King Narai | |
| 1688 | Palace coup against King Narai over the influence of Greek adventurer Constantine Phaulkon and other foreigners; Phaulkon executed | |
| 1767 | Second fall of Ayutthaya | |
| 1768 | King Taksin defeats the Burmese and establishes new Siamese capital at Thonburi | |
| 1782 | New capital established at Bangkok, accession of King Yotfa, Rama I | |
| 1822 | First trade treaty with Britain | |
| 1851 | Accession of King Mongkut, Rama IV | |
| 1855 | Bowring Treaty | |
| 1863 | French protectorate of Cambodia | |
| 1868 | Accession of King Chulalongkorn, Rama V | |
| 1872 | Chulalongkorn's visit to India | |
| 1874 | Front Palace Incident; Anglo-Siam Treaty over Chiang Mai; edict abolishing slavery | |
| 1890 | Establishment of Privy Purse Bureau | |
| 1892 | Formation of ministerial council | |
| 1893 | French gunboats threaten Bangkok (Paknam Incident); foundation of Ministry of Interior | |
| 1897 | Chulalongkorn's first visit to Europe | |
| 1901 | Isan Holy Men's rebellion | |
| 1902 | Phrae revolt; southern states revolt; Sangha Act | |
| 1904 | Siam Society founded | |
| 1905 | Conscription edict | |
| 1908 | Sun Yat Sen visit to Bangkok | |
| 1909 | Anglo-Siamese Treaty finalizes Siam's boundaries | |
| 1910 | Accession of King Vajiravudh, Rama VI; Chinese strike in Bangkok | |
| 1912 | Plot uncovered in military | |
| 1913 | Nationality Act; Surname Act | |
| 1916 | Foundation of Chulalongkorn University | |
| 1917 | Siamese forces to fight on Allied side in World War 1 in Europe | |
| 1925 | Accession of King Prajadhipok, Rama VII | |
| 1927 | People's Party founded in Paris | |
| 1928 | Boycott of Japanese goods | |
| 1930 | Ho Chi Minh forms Communist Party of Siam | |
| 1932 | Revolution results in change from absolute to constitutional monarchy | |
| 1933 | Boworadet Revolt | |
| 1934 | Foundation of Thammasat University; Phibun Songkram becomes minister of defence and army chief | |
| 1935 | Abdication of King Prajadhipok | |
| 1937 | Second boycott of Japanese imports | |
| 1938 | Phibun becomes prime minister | |
| 1939 | Siam renamed as Thailand | |
| 1941 | Japanese army enters Thailand; Thailand declares war on Allies; battle with French in which 59 Thai troops killed; Victory Monument erected | |
| 1942 | Phibun's Sangha Act; Communist Party of Thailand refounded | |
| 1944 | Seri Thai resistance network established; Phibun ousted as prime minister | |
| 1945 | Seni Pramoj returns from the US to conduct peace negotiations | |
| 1946 | Pridi Banomyong's constitution; death of King Ananda Mahidol, Rama VIII; accession of King Bhumibol Adulyadej, Rama IX | |
