The known history of the

monarchy of Thailand The monarchy of Thailand (whose monarch is referred to as the king of Thailand; th, พระมหากษัตริย์ไทย, or historically, king of Siam; th, พระมหากษัตริย์สยาม) refers to the c ...

begins with the founding of the

Sukhothai Kingdom The Sukhothai Kingdom ( th, สุโขทัย, , IAST: , ) was a post-classical Thai kingdom (mandala) in Mainland Southeast Asia surrounding the ancient capital city of Sukhothai in present-day north-central Thailand. The kingdom was fo ...

, inaugurated by

Si Inthrathit Si Inthrathit ( th, ศรีอินทราทิตย์, ; also spelt ) was the first king of the Sukhothai Kingdom, a historical kingdom of Thailand, and ruled from 1238 until around 1270. He is credited as the founder of the Phra Ruang (� ...

in 1238. This was succeeded by the

Ayutthaya Kingdom The Ayutthaya Kingdom (; th, อยุธยา, , IAST: or , ) was a Siamese kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Ayutthaya, in Siam, or present-day Thailand. The Ayutthaya Kingdom is conside ...

and the short-lived

Thonburi Kingdom The Thonburi Kingdom ( th, ธนบุรี) was a major Thai people, Siamese kingdom which existed in Southeast Asia from 1767 to 1782, centered around the city of Thonburi, in Siam or present-day Thailand. The kingdom was founded by Taksin ...

. The present reigning

dynasty A dynasty is a sequence of rulers from the same family,''Oxford English Dictionary'', "dynasty, ''n''." Oxford University Press (Oxford), 1897. usually in the context of a monarchical system, but sometimes also appearing in republics. A ...

, the

Chakri Dynasty The Chakri dynasty ( th, ราชวงศ์ จักรี, , , ) is the current reigning dynasty of the Kingdom of Thailand, the head of the house is the king, who is head of state. The family has ruled Thailand since the founding of the ...

, took the throne in 1782, founding the Rattanakosin Kingdom. The present-day

constitutional monarchy A constitutional monarchy, parliamentary monarchy, or democratic monarchy is a form of monarchy in which the monarch exercises their authority in accordance with a constitution and is not alone in decision making. Constitutional monarchies dif ...

was established in 1932. The Chakri kings are often known as

Rama Rama (; ), Ram, Raman or Ramar, also known as Ramachandra (; , ), is a major deity in Hinduism. He is the seventh and one of the most popular '' avatars'' of Vishnu. In Rama-centric traditions of Hinduism, he is considered the Supreme Bein ...

: the reigning monarch is King

Rama X Vajiralongkorn ( th, วชิราลงกรณ; , ; born 28 July 1952) is the King of Thailand. He is the only son of King Bhumibol Adulyadej and Queen Sirikit. In 1972, at the age of 20, he was made crown prince by his father. After his ...

(Vajiralongkorn).

Family tree

– Phra Ruang dynasty (1238–1368, 1368–1438)

– Uthong dynasty (1350–1370, 1388–1409) – Suphannaphum dynasty (1370–1388, 1409–1569) – Sukhothai dynasty (1569–1629) – Prasat Thong dynasty (1629–1688) – Ban Phlu Luang dynasty (1688–1767)

– Thonburi dynasty (1768–1782) Rattanakosin Kingdom and

Kingdom of Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Mainland Southeast Asia, Indochinese Peninsula, spanning , with a population of almost 70 mi ...

(1782–present) –

Chakri dynasty The Chakri dynasty ( th, ราชวงศ์ จักรี, , , ) is the current reigning dynasty of the Kingdom of Thailand, the head of the house is the king, who is head of state. The family has ruled Thailand since the founding of the ...

(1782–present) {{Aristocratic family trees, state=expanded

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...

Thai monarchs Dynasty genealogy