The Sukhothai Kingdom was a post-classical Siamese kingdom (maṇḍala) in Mainland Southeast Asia centred on the ancient city of Sukhothai in present-day north-central Thailand. A trading town on the routes between the Mon, Tai and Xiān polities, it had become a city-state by 1127. Its political order took shape over the late 12th and 13th centuries through contests among neighbouring centres, among them Chaliang–Si Satchanalai, Kamphaeng Phet, and Mueang Rat. The events of 1238, which brought Si Inthrathit to power, are traditionally taken as the kingdom's formation, though how they should be read is disputed. Sukhothai remained a separate polity until 1438, when it passed under Ayutthaya after the death of Borommapan.
Chronicle traditions date Sukhothai's beginnings to the 5th or 7th century and place it first under Lavo. They then have it ruled by a Monic dynasty from Haripuñjaya from the 950s, and from the mid-12th century by Siamese lines of the central Menam valley. Older scholarship held that the Xiān were briefly subordinate to Angkor between the late 12th and early 13th centuries, and read 1238 as Sukhothai's liberation from a Khmer garrison and the beginning of an independent Tai kingdom. Later work has questioned both points. It notes Siamese control of Sukhothai before 1238, and reads the events of that year as a contest between local lords who both drew on Khmer titles and alliances.
After 1238, Sukhothai was paired with Si Satchanalai, a relationship read variously as one polity with two centres and as two distinct polities under separate ruling lines. The polity is traditionally held to have reached its greatest extent under Ram Khamhaeng the Great, whom some historians credit with introducing Theravada Buddhism and the initial Thai script. Later scholars read the extent claimed in his inscription as a network of relationships with neighbouring polities rather than direct rule. Ram Khamhaeng also began relations with Yuan China, through which the kingdom developed the techniques to produce and export ceramics such as sangkhalok ware. After his death the tributaries fell away, a change also read as a reorganisation of the region into loose confederations. In 1349, during the reign of Li Thai, armies from Ayutthaya invaded and made Sukhothai a tributary, though how far that subjection went is debated. Sukhothai's nobility nonetheless continued for centuries to shape the Ayutthaya monarchy through the Sukhothai dynasty.
Sukhothai was long regarded in Thai historiography as "the first Thai kingdom", a description the Fine Arts Department has since dropped, according to Sujit Wongthes. The origins of the Thai people extend much further back in time. The ruins of the kingdom's capital, now outside the modern town of Sukhothai Thani in Sukhothai Province, are preserved as the Sukhothai Historical Park and have been designated a UNESCO World Heritage Site.
Etymology The Thai name Sukhothai (, ) is a compound of Indic origin.Nawawongs, Chirayu, M.L. "Sanskrit Words in the Thai Language," in Raghavan, V. (1972). Proceedings Of The First International Sanskrit Conference Vol. II, Part I. New Delhi: Ministry of Education and Socia Welfare, Government of India, New Delhi, India. p. 351. "In A.D. 1492 a rock inscription was made for a king of Sukhothai, a kingdom to the north of Bangkok. The inscription which is the earliest extant record of the Thai language, contains many Skt. and Pali words : /súkhôothaj/ :dawn of happiness’ from sukhodaya, ..."Phramaha Nantakorn Piyabhani. "Sukhothai Kingdom: The Golden Age of Buddhism,"Journal of International Buddhist Studies, 7(2)(December 2016): 124. "Sukhothai or Sukhodaya, according to historical tradition of Thailand is still recorded as the “First Thai Kingdom.” The word “Sukhodaya” derives from the combination of two Pali words, Sukha and Udaya. Sukha means happiness whereas Udaya stand for dawn. Therefore, it literally means "The Dawn of Happiness."Khoksantiya, Mali; Woodward, Hiran W.; Nicholas and Eileen Lane Collection of Travel Guides and Literature (1972). Guide to Old Sukhothai. BANGKOK: The Fine Arts Department of Thailand. p. 1. Griswold, A. B., and Prasert na Nagara. "The Epigraphy of Mahadharmaraja I of Sukhodaya. Epigraphic and Historical Studies, No. 11, Part II," Journal of The Siam Society, Vol. 61, Part II (July 1973): 100. (Footnote 2). "We have regularized the spelling of most proper name's of Sanskrit or Pali origin, for example Sukho-daya (written sukhodai), ..." It joins sukha ()"सुख". LearnSanskrit.cc Retrieved 28 March 2026. to udaya ()"उदय". LearnSanskrit.cc Retrieved 28 March 2026., and is treated as a corrupted form of Sanskrit and Hindi Sukhodaya (),"Sukhodaya, Sukha-udaya: 8 definitions". WisdomLibrary.org. Retrieved 3 April 2026.Graham, Walter Armstrong (1913). Siam: A Handbook of Practical, Commercial, and Political Information, With 90 Illustrations and a Maps. (2nd ed.). LONDON: F. G. Browne & Co. p. 169. "Sukhothai (Sukho, happiness, Thai, free), a corruption of Sukhodaya, ‘the Dawn of Happiness,’" Sukhada (),"Sukhada, Sukha-da, Sukhadā: 16 definitions". WisdomLibrary.org. Retrieved 3 April 2026.Gerini, G. E. (1909). Researches on Ptolemy's Geography of Eastern Asia (Further India and Indo-Malay Archipelago). LONDON: Royal Asiatic Society; Stephen Austin and Sons. p. 179. or Sukhadaya ()."सुखदाय". Amarkosh Linguistics. Retrieved 3 April 2026.Gerini, G.E. "SHAN AND SIAM," The Imperial and Asiatic Quarterly Review and Oriental and Colonial Record, Third Series—Volume V. Nos. 9 & 10, January–April, 1989. p. 149. "the Sanskrit-Pali Udaya, which occurs in the compound Sukhodaya (Sakha + udaya = “the dawn of prosperity”) the name of Sukhothai, the former capital of Northern Siam, and, at times, of the whole of the country." p. 154: "the term Sukhothai (i.e. Sukhodaya or Sukhadaya) the name of the ancient Siamese capital, explained as Thai pen sukh, i.e. "The Happy Thai." The name has been rendered "the dawn of happiness", "the dawn of prosperity" and "rising happiness", and glossed as "the Happy Thai".
G. E. Gerini gave the city an earlier name still. On his account it rose about 70 BC as Sukda, Sukhada or Sukhodaya.Gerini, G. E. "SIAMESE ARCHAEOLOGY: A SYNOPTICAL SKETCH," in Royal Asiatic Society of Great Britain and Ireland (1904). The Journal of the Royal Asiatic Society of Great Britain and Ireland for 1904. London: Stephen Austin, and Sons, Limited. p. 234. "By the sixth century A.D. no less than three cities had risen in Central Siam, to wit : 1, Swankhalok (Svargaloka or Sajjandlaya, 95 B.C.); 2, Sukhothai (Sukhada, Sukhodaya, circa 70 B.C.); and 3, ..." The form Sukhothai came into use in central Siam later. The Mon-Khmer inhabitants of the territory are said to have pronounced it Sakkadéa, syncopated to Sakdéa or Sakda.
History Early settlement and regional networks
Founding traditions
The traditions disagree about when Sukhothai was founded, and none of them is contemporary. One chronicle tradition places the founding of Sukhothai in 494 CE, followed by its twin city of Chaliang (). The Legend of the Arhat (Tamnan Nithan Phra Arahant; ) instead gives 679 CE and names the founder as Indrajayadhirāja (), from the city of Nakhon Luang (, "capital city", possibly Lavapura). He was deposed in 687 by Balidhiraja, elder son of Kalavarnadisharaja of Lavo. Who followed Balidhiraja is obscure in the surviving record.
From the late 7th to early 8th centuries, the lands south of the mountains of the Yom and Nan basins lay, on Tatsuo Hoshino's reading of the Cefu Yuangui and the Book of Tang, within the territory of Qiān, centred at Si Thep. On the same reading, those mountains, in present-day northern Thailand, formed the territory of Duō Mó Cháng ().
By the latter half of the 8th century, a local textual tradition holds that Sukhothai and Lavo were subsequently brought under the authority of Padumasūriyavaṁśa (), presented in these narratives as the first Siamese sovereign. He has been identified with Pra Poat honne Sourittep pennaratui sonanne bopitra in the European accounts, whose reign is conventionally dated 757–800 CE.
For the 9th and early 10th centuries the city is generally presumed to have been abandoned after an incursion by the legendary Khom kingdom of Suvarṇakōmakam (), in the region of present-day Chiang Saen. However, two difficulties attach to that presumption. A separate tradition has Sukhothai playing an active part in the succession of the Dvaravati polity of Sambuka in the same period. Its ruler is said to have adopted Sambuka's prince Balaraj, backed his overthrow of his own father, and installed him as monarch of Sambuka, whose reign is put at 867 to 913 CE. Separately, Suvarṇakōmakam is widely identified as the predecessor of the Yonok Kingdom and is generally understood to have flourished before the 7th century, some two centuries before the incursion attributed to it.
Mon rulers and Tai Yuan incursions
Sukhothai and the rest of the upper Menam valley, including Si Satchanalai and (also known as Phichai Chiang Mai; ), came under the control of a Monic dynasty from Haripuñjaya. This followed the fall of Lavo to Tambralinga in 927 and of Rāmaññadesa (; potentially the eastern Menam valley) to Angkor in 946.Hall, Kenneth R. “Khmer Commercial Development and Foreign Contacts under Sūryavarman I.” Journal of the Economic and Social History of the Orient, vol. 18, no. 3, 1975, pp. 318–336. JSTOR, http://www.jstor.org/stable/3632140. Accessed 3 June 2020. The records the dynasty as led by Abhayakamini from the 950s onward. He is reported to have taken Sukhothai around 957, having fled Haripuñjaya when its capital was captured by another Khom polity, Umoṅkaselā (), in what is now Fang. At the same time, the Phitsanulok area is recorded in the Ayutthaya Testimonies as having been governed by Sudhammaraja, a Xiān monarch who had relocated northward from the Phraek Si Racha region in the central Menam valley. Sukhothai's traditionally interpreted declaration of independence from Umoṅkaselā occurred in 1017, during the reign of Arunaraja.
Later, during the reign of Suvacanaraja of Si Satchanalai, which commenced around the 1050s, the upper Menam territories faced an incursion by a coalition of Tai Yuan mueangs under Śrīdharmatripiṭaka () of Ngoenyang Chiang Saen. Before the fighting, the Xiān rulers of Phitsanulok, led by Vijayaraja, are recorded as having moved south to Phetchaburi. The conflict was ultimately resolved through negotiation. To establish a dynastic alliance, Suvacanarāja gave his only daughter in marriage to Śrīdharmatripiṭaka. This interdynastic union produced two princes, the elder of whom, Kesariraja, later became ruler of the Lavo Kingdom.
After these events, no further record explicitly attests to the continuation of this Monic dynasty. In contrast, Śrīdharmatripiṭaka is noted to have remained influential in the region, particularly through the reconstruction of Phitsanulok under his authority. Śrīdharmatripiṭaka is described as settling at Phitsanulok and holding power there until his death. The move has been tentatively dated to about 1106. His son, Kesariraja, is further recorded as having married a daughter of an otherwise unidentified ruler of Si Satchanalai. Their son later married a Xiān princess under Phra Chao Luang at Ayodhya.