A short history of Thailand: from Sukhothai to today

Thailand's story runs through four capitals: Sukhothai (from about 1238), Ayutthaya (1351 to 1767), Thonburi (1767 to 1782) and Bangkok (since 1782). The country, then called Siam, was never colonised by a European power. In 1932 it became a constitutional monarchy, and in 1939 it took the name Thailand.

Timeline at a glance

• About 1238: the Sukhothai kingdom, the first Thai kingdom (Sukhothai Historical Park today)
• 1351 to 1767: Ayutthaya, a trading capital for over 400 years (Ayutthaya Historical Park)
• 1767 to 1782: Thonburi, after the fall of Ayutthaya
• 1782: Bangkok becomes the capital under the Chakri kings (the Grand Palace and Wat Phra Kaew)
• 1932: the end of absolute monarchy
• 1939: Siam is renamed Thailand

Sukhothai: the first Thai kingdom (about 1238)

Sukhothai emerged as an important Thai kingdom around 1238 in what is now northern-central Thailand. Its name means "Dawn of Happiness". The kingdom is often associated with the early development of Thai writing, Buddhist art and culture. Today, the Sukhothai Historical Park is a UNESCO World Heritage Site and a popular destination for visitors interested in Thailand's past.

Read more: The Sukhothai kingdom /en/blogs/history-of-sukhothai-kingdom-thailand/

Ayutthaya: 400 years of a trading capital (1351 to 1767)

Founded in 1351, Ayutthaya became one of Southeast Asia's most powerful kingdoms and an important international trading centre. Its merchants traded with China, Japan, Persia and European countries. The city flourished for more than 400 years before Burmese forces captured and destroyed much of it in 1767. Today, the Ayutthaya Historical Park is a UNESCO World Heritage Site, making it one of the most interesting historical day trips from Bangkok.

Read more: The Buddha head in the tree /en/blogs/buddha-head-tree-ayutthaya-history-nature/

Thonburi: a short new start (1767 to 1782)

After the fall of Ayutthaya in 1767, General Taksin reunited much of the country and established Thonburi as the new capital. Located on the western bank of the Chao Phraya River, Thonburi served as the capital for 15 years. In 1782, King Taksin's reign came to an end, and General Chakri established a new royal dynasty and moved the capital across the river to Bangkok.

Bangkok and the Chakri kings (since 1782)

In 1782 General Chakri became King Rama I and moved the capital across the river to Bangkok. The Chakri family still reigns today. Bangkok's Grand Palace and Wat Phra Kaew were built in these first years.

In the 1800s, Kings Mongkut (Rama IV) and Chulalongkorn (Rama V) opened the country to the West and modernised it. Siam was never colonised by a European power.

1932: the end of absolute monarchy

On 24 June 1932, a political group known as the People's Party (Khana Ratsadon), made up of military officers and civilian leaders, led a revolution that ended absolute monarchy in Siam. King Prajadhipok (Rama VII) accepted the transition to a constitutional monarchy. Thailand's first constitution was signed on 10 December 1932, marking a major turning point in the country's political history.

Read more: Constitution Day /en/blogs/history-of-constitution-day-thailand/

From Siam to Thailand (1939)

In 1939 the government of Field Marshal Plaek Phibunsongkhram changed the country's name from Siam to Thailand, often translated as "land of the free". The name went back to Siam in 1945 and became Thailand again in 1949.

Modern Thailand

King Bhumibol Adulyadej (Rama IX) reigned for 70 years, from 1946 until his death on 13 October 2016. His son, King Maha Vajiralongkorn (Rama X), succeeded him and was crowned in May 2019. Today, Thailand is a constitutional monarchy with a modern political system that has experienced several changes over the years. The country held a general election on 8 February 2026, marking another chapter in its political history.

Read more: Thailand's 2026 election /en/blogs/thailand-election-2026-results/ | The Thai calendar /en/blogs/thai-calendar-explained-why-year-2569/