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Thailand

country in Southeast Asia

82 dated entries naming Thailand, drawn from 75 separate years between 543 BCE and 2025 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

Also written as Siam in the source articles; Wikipedia redirects those to the same subject, so their entries are on this page.

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6th century BC

  • 543 BCEGautama Buddha Mahaparinibbana (traditional in Thailand and elsewhere - basis of Thai solar calendar)source

6th century

  • 600The oldest inscription in Mon language dated from 600 AD. later found at Wat Phorang, Thailand.source

7th century

  • 633Jamadevi, queen of Hariphunchai (Thailand) (approximate date)source
  • 698Khun Lo, a Thai prince, conquers Muang Sua, an early Laotian kingdom.source

8th century

  • 760The Kingdom of Nanzhao (Nanchao) in modern-day southern China expands into the Irrawaddy River region, first into Burma, then down into northern Laos and Thailand (approximate date).source

11th century

  • 1096Phayao, a modern-day province of Thailand, is founded as a city-state kingdom.source

13th century

  • 1253Mongol forces under Kublai Khan conquer the Dali Kingdom (modern-day Yunnan). The population migrates to Siam (modern Thailand).source
  • 1259Lannathai, a kingdom in the north of Thailand, is founded by King Mangrai.source
  • 1260The newly formed Sukhothai Kingdom of Thailand adopts Theravada Buddhism.source
  • 1279Ram Khamhaeng becomes the third king of the Phra Ruang dynasty, ruling the Sukhothai Kingdom (modern-day Thailand).source
  • 1281The Mon Kingdom of Hariphunchai falls, as its capital Lamphun (in modern-day Thailand) is captured by King Mangrai's Lannathai Kingdom.source
  • 1287Kings Mangrai of the Lanna Kingdom (modern Thailand) and Ram Khamhaeng of the Sukhothai Kingdom agree to a peace treaty. They establish a "strong pact of friendship".source

14th century

  • 1351March 4 – The Ayutthaya Kingdom is established by King Uthong (Ramathibodi I) in modern-day Thailand. He begins to propagate Theravada Buddhism as the state religion.source
  • 1365The Sukhothai Kingdom in northern Thailand becomes a tributary state of the Ayutthaya Kingdom.source
  • 1368Maha Thammaracha II becomes ruler of the Sukhothai Kingdom (in modern-day northern Thailand) after the death of Maha Thammaracha I.source
  • 1369The Thai Ayutthaya Kingdom conquers Cambodia for a second time.source
  • 1371Kalamegha claims the vacant title of King of Cambodia after the power of the Thai invaders from Ayutthaya begins to weaken. The Ayutthayans are finally expelled in 1375.source
  • 1383The Wat Phra That Doi Suthep Temple is built in modern-day Thailand, by King Kuena of Lanna.source
  • 1388Ramesuan is reinstated as King of Ayutthaya (modern-day southern Thailand), after dethroning and executing 17-year-old King Thong Lan.source
  • 1395Ramaracha succeeds Ramesuan as ruler of the Ayutthaya Kingdom in present-day southern Thailand.source

15th century

  • 1405December 27 – The Imperial Chinese Army invades the Lan Na kingdom, covering an area now divided between Myanmar, Thailand and China's Yunnan province.source

16th century

  • 1548June 10 – (5th day of the waxing moon in the 8th month of the 910th year of the Chula Sakarat Era): Yotfa, the 13-year-old ruler of the Ayutthaya Kingdom of Thailand since 1546, is murdered with the consent of his mother, the regent Si Sudachan, who installs her lover, Worawongsathirat, on the throne. Yotfa's younger brother, Prince Sissin, is spared from execution. Worawongsathirat and Si Sudachan are both killed in a counter-coup in November.source
  • 1548November 11 – Worawongsathirat, ruler of the Ayutthaya Kingdom of Thailand after usurping the throne on June 10, stages his coronation along with his wife, Si Sudachan. Both husband and wife had after both conspired to murder her son, King Yofta, in June. The King and Queen are assassinated on January 13, 1549.source
  • 1569August 2 – Burma invades Siam and captures Ayutthaya. Siam becomes a vassal of Burma.source
  • 1586October 19– Burmese–Siamese War (1584–1593): Nanda Bayin, King of Burma, launches a two-pronged invasion of the Ayutthaya Kingdom (now Thailand) with 25,000 troops, 1,200 horses and 220 elephants. The invasion will fail, as thousands of troops die from starvation and disease and the Burmese troops will withdraw in April.source
  • 1587April 20 (14th waxing of Kason 949 ME) – Burmese–Siamese War (1584–1593): Burma's siege of Ayutthaya (now in Thailand), capital of the Ayutthaya Kingdom, fails after six months as the troops of Burma's King Nanda Bayin begin their withdrawal.source
  • 1590November 22 (12th waning of Tazaungmon 952 ME) – Burmese King Nanda Bayin sends a his son, the Crown Prince Mingyi Swa and 20,000 troops to what is now Thailand.source

17th century

  • 1603May 13 – In modern-day northern Thailand, the rulers of Chiang Mai retake control of the Nan province and capture its ruler, Cao Cetabut.source
  • 1604April 9 – On the first day of the new year 966 M.E. on the Burmese calendar, King Nyaungyan Min of Burma makes a triumphant return to his capital at Inwa after his victory in the war against the principality of Mongnai (Monē), one of the Shan States between Burma and Siamsource
  • 1616The first Thai embassy to Japan arrives.source
  • 1656August 8 – In the Ayutthaya Kingdom, comprising most of the territory now occupied by Thailand, King Prasat Thong dies after a reign of more than 25 years. His eldest son, Prince Chao Fa Chai, is crowned as King Sanpet VI but Prasat's brother plots the new king's overthrow.source
  • 1663February 10 – The army of the Kingdom of Siam (now Thailand) captures Chiang Mai from the Kingdom of Burma (now Myanmar), using it as a base for launching a larger attack on the Burmese coast in November.source
  • 1685December 10 – In what is now Thailand, King Narai of Ayutthaya signs a treaty with representatives of France at Lopburi, allowing Roman Catholic missionaries to preach the Gospel and exempting Thai Catholics from work on Sunday, as well as appointing a special court to settle disputes between Thai Christians and non-Christians.source

18th century

  • 1733January 13 – Borommarachathirat V becomes King of Siam (now Thailand) upon the death of King Sanphet IX.source
  • 1760April 11 – The Burmese Army, under the command of King Alaungpaya, reaches the outskirts of Siam's capital, Ayutthaya, but then retreats rather than laying siege to the city.source
  • 1767December 28 – Phraya Taksin, a minor provincial official in Siam (now Thailand), crowns himself as King of Siam, establishing the Siamese Thonburi Kingdom, taking the regnal name of Borommaracha IV and begins a 14-year reign of liberation and conquest; historically, he is known as "Taksin the Great".source
  • 1782April 6 – Rama I overthrows King Taksin of Siam (now Thailand) in a coup d'état, and moves the political capital from Thonburi, across the Chao Phraya River to Rattanakosin Island, the historic center of Bangkok.source

19th century

  • 1809September 7 – Buddha Yodfa Chulaloke (Rama I), King of Siam, founder of the Chakri dynasty of Thailand (born 1737)source
  • 1827January – In Laos, King Anouvong of Vientiane leads the Laotian Rebellion against Siam and successfully attacks Nakhon Ratchasima (the Siamese later invade Vientiane and nearly destroy the whole city).source
  • 1833H.R.H. Prince Mongkut of Siam founds the Dhammayut Buddhist reform movement.source
  • 1868October 1 – Mongkut (Rama IV), King of Siam (Thailand) (born 1804)source
  • 1899May 2 – The Kingdom of Siam (modern-day Thailand) cedes its province of Luang Prabang (now Laos) to France.source

20th century

  • 1902March 15 – The Pattani Sultanate is abolished by the Siamese authority after the last sultan of Pattani refused new administrative reforms by the Siamese.source
  • 1910October 23 – King Chulalongkorn (Rama V) of Siam (born 1853)source
  • 1925November 26 – King Vajiravudh (Rama VI) of Siam (born 1880)source
  • 1932June 24 – After a relatively bloodless military rebellion, Siam becomes a constitutional monarchy.source
  • 1933April 3 – An anti-monarchist rebellion occurs in Siam (Thailand).source
  • 1935March 2 – King Prajadhipok (Rama VII) of Siam abdicates the throne; he is succeeded by his 9-year-old-nephew Ananda Mahidol (Rama VIII).source
  • 1941January 1 – Thailand's Prime Minister Plaek Phibunsongkhram decrees January 1 as the official start of the Thai solar calendar new year (thus the previous year that began April 1 had only 9 months).source
  • 1943October 17 – The Burma Railway is completed between Bangkok, Thailand and Rangoon, Burma (modern-day Myanmar) (415 km) by the Empire of Japan, to support its forces in the Burma campaign, using the forced labour of Asian civilians and Allied Prisoners of war.source
  • 1946June 9 – In Thailand, King Bhumibol Adulyadej (Rama IX) accedes to the throne after the death of his elder brother, King Ananda Mahidol (Rama VIII). He will reign until his death on October 13, 2016.source
  • 1949June 5 – Thailand elects Orapin Chaiyakan, the first Thai female member of Thailand's Parliament.source
  • 1954September 8 – SEATO is established in Bangkok, Thailand.source
  • 196017 September – King Bhumibol of Thailand makes a state visit to Luxembourg, lasting until 19 September.source
  • 196628 May – The Malaysian and Indonesian governments declared that the confrontation was over. The peace treaty was signed in Bangkok, Thailand.source
  • 1967August 8 – The Association of Southeast Asian Nations (ASEAN) is founded in Bangkok, Thailand.source
  • 1975April 7 - Prime Minister Long Boret met with representatives of the Khmer Rouge while in Bangkok, Thailand. He returned to Cambodia the next day, refused to leave when officials were offered a chance to escape, and was executed nine days later by the new regime.source
  • 1976October 6 – Students gathering at Thammasat University in Bangkok, Thailand are massacred, while protesting the return of ex-dictator Thanom Kittikachorn by a coalition of right-wing paramilitary and government forces, triggering the return of the military to government.source
  • 1979January 7 – Cambodian–Vietnamese War: The People's Army of Vietnam and Vietnamese-backed Cambodian insurgents announce the fall of Phnom Penh, Cambodia, and the collapse of the Pol Pot regime. Pol Pot and the Khmer Rouge retreat west to an area along the Thai border, ending large-scale fighting.source
  • 1988April 5 – Kuwait Airways Flight 422 is hijacked while en route from Bangkok, Thailand, to Kuwait. The hijackers demand the release of 17 Shiite Muslim prisoners held by Kuwait. Kuwait refuses to release the prisoners, leading to a 16-day siege across 3 continents. Two passengers are killed before the siege ends.source
  • 1989November 4 – Typhoon Gay devastates Thailand's Chumphon Province.source
  • 1989December 2 – The Second Malayan Emergency concludes with a peace agreement. The Malayan Communist Party disbands and Chin Peng remains in exile in Thailand until his death in 2013.source
  • 1991May 26 – Lauda Air Boeing 767 crashes near Bangkok, Thailand, killing all 223 people on board.source
  • 19929 May - Michelle McLean, Miss Namibia, is crowned Miss Universe at Bangkok, Thailand. Is the first and only time that Namibia wins the contest.source
  • 1992May 17 – Protests begin in Bangkok, Thailand, against the government of General Suchinda Kraprayoon, sparking a bloody crackdown.source
  • 1993August 13 – More than 130 die in the collapse of Royal Plaza Hotel at Nakhon Ratchasima in Thailand's worst hotel disaster.source
  • 1997July 11 – Royal Jomtien Resort Hotel fire at Pattaya, Thailand's worst hotel fire, kills 90.source
  • 1997November 2 – Severe Tropical Storm Linda devastates southern Vietnam and Thailand, killing 3,275 people.source

21st century

  • 2003October 20–21 APEC Thailand 2003 took place in Bangkok, Thailand.source
  • 2004December 26 – The 9.1–9.3 Mw Indian Ocean earthquake shakes northern Sumatra with a maximum Mercalli intensity of IX (Violent). One of the largest observed tsunamis follows, affecting coastal areas of Thailand, India, Sri Lanka, Somalia, the Maldives, Malaysia, Myanmar, Bangladesh, and Indonesia, killing 227,000 people.source
  • 2007May 16 – A 6.1-magnitude earthquake strikes in remote northern Laos, and is felt as far away as Bangkok, Thailand, and Hanoi, Vietnam, where shoppers fled malls and high-rise buildings are evacuated. In Luang Prabang, 92 km. from the epicenter, residents said they felt only minor shaking. There were no reports of injuries or severe damage.source
  • 2007November 2 – Cambodia will build a new rail link to Thailand with US$80 million in funds it received from the Asian Development Bank and OPEC. Work on the 48-kilometer line between Sisophon and Poipet will start early next year and be completed by 2010, transport minister Sun Chanthol says.source
  • 2010May 19 – Protests in Bangkok, Thailand, end with a bloody military crackdown, killing 91 and injuring more than 2,100.source
  • 2011July 31 – In Thailand over 12.8 million people are affected by severe flooding. The World Bank estimates damages at 1,440 billion baht (US$45 billion). Some areas are still six feet under water, and many factory areas remain closed at the end of the year. 815 people are killed, with 58 of the country's 77 provinces affected.source
  • 2016December 1 – Following a mourning period of seven weeks after the death and funeral of Bhumibol Adulyadej, Vajiralongkorn formally succeeds his late father as the new King of Thailand.source
  • 2018July 10 – Twelve boys and their football coach are successfully rescued from the flooded Tham Luang Nang Non cave in Thailand, following a 17-day ordeal that gained worldwide attention. One person, a law enforcement officer is killed.source
  • 20194 February – 25-year-old Australian footballer and refugee from Bahrain, Hakeem al-Araibi, is ordered to defend an extradition order back to Bahrain in a Bangkok court, after being detained upon arrival in Thailand for his honeymoon with his wife in November 2018. International community is treating it as a human rights issue; a campaign to free al-Araibi and return him to Australia is growing.source
  • 2023August 22 – Former Prime Minister Thaksin Shinawatra returns to Thailand after 15 years of political exile.source
  • 2024December 29 – Jeju Air Flight 2216, a Boeing 737-800 passenger flight from Bangkok Suvarnabhumi Airport in Bangkok, Thailand, to Muan International Airport in Muan, South Korea, veers off the runway at Muan International Airport and crashes into a barrier, killing 179 people. Two injured survivors are reported.source
  • 2025July 24 – Armed conflicts break out between Cambodia and Thailand after the escalation of a border dispute. At least 39 people are killed and more than 100,000 displaced due to the conflicts.source
  • 2025November 4 – Typhoon Kalmaegi leaves more than 288 people dead in the Philippines, Vietnam, and Thailand.source
  • 2025November 26 – Cyclone Senyar causes at least 1,390 deaths and leaves 186 missing in Thailand, Malaysia and Indonesia.source

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