1782 Rama I of Siam (modern day Thailand) founds the Chakri dynasty.
1851 Rama IV is crowned King of Thailand.
1941 Japanese forces invade Thailand's southern peninsula. They face a heavy resistance, however, Plaek Phibunsongkhram ordered a ceasefire.
1942 World War II: The United Kingdom declares war on Thailand.
1942 World War II: Australia declares war on Thailand.
1946 King Bhumibol Adulyadej ascends to the throne of Thailand. He is currently the world's longest reigning monarch.
1946 Thailand joins the United Nations.
1949 Siam officially changes its name to Thailand for the second time. The name had been in use since 1939 but was reverted in 1945.
1973 In the Thammasat student uprising over 100,000 people protest in Thailand against the Thanom military government; 77 are killed and 857 are injured by soldiers.
1976 Vietnam War: The U.S. military completes its troop withdrawal from Thailand.
1976 Massacre of students gathering at Thammasat University in Bangkok, Thailand to protest the return of ex-dictator Thanom, by a coalition of right-wing paramilitary and government forces, triggering the return of the military to government.
1991 Lauda Air Flight 004 explodes over rural Thailand, killing 223.
1993 In Thailand, a fire at the Kader Toy Factory kills 188 workers.
2004 A 9.3 magnitude earthquake creates a tsunami causing devastation in Sri Lanka, India, Indonesia, Thailand, Malaysia, the Maldives and many other areas around the rim of the Indian Ocean, killing over 250,000 people including over 1700 on a moving train
2007 One-Two-GO Airlines Flight 269 carrying 128 crew and passengers crashes in Thailand killing 89 people.