National Museum , one of the earliest Buddhist stupas in Thailand, possibly dating to the time of the Ashokan missions , a Khmer Mahayana Temple in
Lopburi, constructed during the reign of
Jayavarman VII (c.1181–1218)
Buddhism in the pre-Thai kingdoms The
Mahāvaṃsa, a historical chronicle of Sri Lanka, mentions that during the reign of
Ashoka (c. 268 to 232 BCE), monks
Sona Thera and
Uttara Thera were
sent to spread Buddhism to
Suvannabhumi, which is somewhere in
Southeast Asia. Thai scholars believe that the
Mon kingdom of Dvaravati (c. 6th to the 11th century) is likely to have received Buddhist missionaries during this era. This is because numerous archeological finds in the ancient Dvaravati cities like
Nakon Pathom point to an early Buddhist presence. Thus, Dvaravati Buddhism was probably an Indian form of
Theravada (or at least a non-Mahayana) Buddhism. The Dvaravati style has been compared to the
Amaravati style and may be influenced by it. It has been suggested that the original structure of the ancient Phra Pathom Stupa (which has been covered by restorations and a spire that was added later) was of similar design to the
Stupa of Sanchi. Later finds at Nakon Pathom and nearby cities also include Buddha images in the
Gupta style. Various
Southeast Asian kingdoms that ruled over parts of modern Thailand, such as the
Khmer Empire (c. 802–1431 CE) and the Mon
Lavo Kingdom (c. 450–1388 CE), were influenced by Indian Buddhist trends, which included
Mahāyāna Buddhism and the
Sanskrit Buddhist tradition. The Mon Kingdom of
Hariphunchai with its capital at
Lamphun was also a Buddhist realm, with famous temples like
Wat Haripunchai (1040) and
Wat Chamadevi (1218). The religious arts of the Indonesian Kingdom of
Srivijaya (c. 650–1377), which controlled part of
Southern Thailand, depict numerous figures from Indian Mahāyāna. Archeological finds in Southern Thailand (such as at Phra Phim and Nakon Sri Thammaraj) attest to the practice of Mahāyāna Buddhism in this region. This was supported by powerful Southeast Asian kings, such as the Burmese
Anawratha (1044–1077), who promoted Theravada throughout the
Bagan Kingdom, which included parts of Thailand that he conquered.
The first Thai states: Sukhothai and Lan Na Beginning in the 7th century,
Thai people gradually migrated from
China to
Southeast Asia. They eventually began conquering Southeast Asian kingdoms like
Hariphunchai and adopting the practice of Buddhism which had existed in the conquered regions. The first ethnic Thai kingdom was the
Sukhothai Kingdom (13th-15th century), which was founded in 1238. At first, both Theravāda and Mahāyāna were practiced in this new Thai realm, as well as Khmer
Brahmanism. During the 13th century, Thai monks traveled to
Sri Lanka to ordain in the Sinhalese
Mahavihara Theravada sect (known as Lankavamsa/Lankavong in Thailand) lineage and to study the teachings. Lankavong monks also traveled to Thailand to teach Theravada Buddhism. King
Ram Khamhaeng ( late 13th century) gave royal support to the Lankavong Theravāda monks in Nakon Sri Thammarath. He invited them to his capital, built monasteries for them, and subsequently sent more monks to Sri Lanka to study. Under the reign of Ram Khamhaeng, the position of
sangharaja (leader of the monastic community) was created and tasked with the administration of the sangha, the orders of monks and nuns. Other monks were also given lower-level administrative positions. Later Sukhothai kings would continue this policy of supporting Lankavong Theravāda, and numerous monasteries, Buddha images and stupas were built during the Sukhothai period. The study of Pali Buddhist texts was also promoted.
Mahathammaracha I (r. 1346–1368) was a Sukhothai king known as a great scholar and patron of Buddhism, who even became a monk for a brief period of four months. A treatise on
Buddhist cosmology, the
Tribhumikatha (
Trai Phum Phra Ruang, "The Three Worlds According to King Ruang"), has been attributed to him, and is one of the oldest traditional works of Thai literature. During the reign of Mahathammaracha I, another group of monks arrived from Sri Lanka, led by Somdet Phra Mahasami (Sumana), who was associated with a Sri Lankan forest monastery named Udumbaragiri. at
Wat Umong in
Chiang Mai Province, Thailand, 13th century. Attributed to
King Mangrai. Further north, in the Thai
Lan Na Kingdom (c. 1292–1775), Theravāda also flourished. Lan Na kings built unique wats (monasteries) which show a blend of Mon, Indian, Burmese and Khmer styles. Some important early Lan Na wats include
Wat Ku Kham (Temple of the Golden Chedi, c. 1288) and Wat Chiang Man (c. 1297) both built by the first Lan Na king
Mangrai (1238–1311).
Wat Phra Singh (c. 1385) is another example of classic Buddhist architecture of the Lan Na kingdom. In the reign of Sam Fang Kaen (1411–1442), a controversy broke out between the Sri Lankan sect of Somdet Phra Mahasami and another Sri Lankan order newly arrived from Ayutthya, which criticized the old order for accepting money and owning rice lands. During his reign, in c. 1477, a Buddhist council convened to review the
Pali Canon. It is considered the eighth Buddhist council in the Thai tradition. Lan Na Buddhism reached its climax during the reign of Tilokaraja's grandson, Phra Mueang Kaeo (1495–1528). His reign saw great achievements in Pali literature, as attested by works like the
Jinakalamali (a historical chronicle, c. 1517), and the great commentary,
Mangalatthadipani. Even though Theravada was now becoming the dominant form of Buddhism in Thailand during this era, Mahayana and Brahmanism also continued to be practiced.
Ayutthya period (1351–1767) and statue of
Buddha,
Wat Mahathat, Ayutthaya During the 14th century, Thai power shifted south with the founding of the
Kingdom of Ayutthya by King
Uthong (r. 1351–1369). Its capital of
Ayutthya was a major center of Buddhism, with many temples and monasteries. There, Buddhist culture adopted both Sukhothai and Khmer elements. Ayutthya kings continued to focus their royal patronage on the Lankavong Theravada sect. They saw themselves as defenders of the religion, which they advanced by supporting the sangha. During the reign of Indraraja I (c. 1422), a new sect of Sri Lankan Theravada, the Vanaratnavong (a.k.a. Pa-Kaeo) sect, was formed by a group of Thai monks who had ordained in Sri Lanka. It mainly differed from the older Lankavong sect in that it was stricter in its practice. , built by King
Naresuan the Great in 1592 The reign of king
Borommatrailokkanat (1431–1488) was a golden era for Thai Buddhism. He encouraged the arts and literature, as well as building numerous monasteries in Ayutthya. He also ordained as monk for eight months at
Wat Chulamani. During his reign, the Vanaratnavong group also grew in prominence. A major literary work of this era is the
Mahachat Kham Luang (Thai: มหาชาติคำหลวง), an epic poem of the "Great Birth" of
Vessantara Bodhisattva, which combined Pali verse with Thai poetry. To this day, the Vessantara Jātaka is one of the most popular stories of one of Gautama Buddha's past lives. It tells the story of a very compassionate and generous prince, Vessantara, who gives away everything he owns. During the late 17th century, French visitors described a state examination system under
King Narai that was administered to Buddhist monks to test their knowledge in the Pali language and in Buddhist doctrine. Those who could not pass were released from their monastic vows and returned to lay life. Those who excelled achieved high social status and officially recognized ranks (
barian). Another later influential king was
Boromakot (r. 1733–1758), who ruled during a peaceful time and was a great patron of Buddhism, founding numerous temples. During his reign, Thailand sent 25 monks to Sri Lanka to re-establish higher ordination (which had been lost due to warfare on the island). The Thai monks helped found the
Siam Nikaya, which remains one of the main monastic orders in Sri Lanka to this day. Numerous major Thai literary compositions were composed during the late Ayutthya era. One of these is
The Legend of Phra Malai (), a Buddhist epic composed by Prince
Thammathibet in 1737. Other Buddhist pieces from this era include the
Sue-ko Kham Chan (, c. 1657) and the
Samutta-Kōt Kham Chan (, c. 1657) by Phra Maha Raja-Kru. Both are
kham chan poems based on the
Paññāsa Jātaka. Though Ayutthya's main
religion remained as Theravada Buddhism throughout its history, many elements of the political and social system were incorporated from
Hindu traditions and numerous rites were conducted by
Brahmins. The kingdom was also home to religious minorities practicing
Mahayana Buddhism,
Islam and
Catholicism. Though we know little of the practices of the Theravada forest monks during the Ayutthya period, it is possible that at this time monks were developing esoteric practices similar to those found in a later Sinhalese work called the ''
Yogāvacara's manual''. These esoteric Theravada practices would produce a tradition called
Southern Esoteric Buddhism, also known as Borān kammaṭṭhāna ('ancient practices'). This esoteric Theravada tradition remained a mainstream Buddhist tradition in
Cambodia,
Laos and Thailand well into the modern era. An inscription from northern Thailand with esoteric elements has been dated to the Sukhothai Kingdom of the 16th century. Kate Crosby notes that this attestation makes the southern esoteric tradition earlier than "any other living meditation tradition in the contemporary Theravada world." Furthermore, numerous pre-Buddhist
animist practices called
Satsana Phi continued to be performed by Thais.
Phi () are spirits of buildings or territories, natural places, or phenomena; they are also ancestral spirits that protect people, and can also include malevolent spirits. The
phi, which are guardian deities of places or towns, are celebrated at festivals with communal gatherings and offerings of food. They are an important part of
Thai folklore and local
folk religion. From the 16th to 19th centuries, there were
numerous wars between Thailand and Burma. The Thai capital was destroyed in 1767, leading to the loss of numerous historical records, literary and religious texts and marking the fall of the Ayutthya kingdom proper. As such, there is scant historical information about Thai religion during this period. Anthropologist-historian
S. J. Tambiah has suggested a general pattern for that era, at least with respect to the relations between Buddhism and the
sangha on the one hand and the king on the other hand. In Thailand, as in other Theravada Buddhist kingdoms, the king was in principle thought of as a patron and protector of the religion (sasana) and the sangha, while sasana ( teaching, practice, discipline and doctrine) and the Sangha were considered in turn the treasures of the polity and the signs of its legitimacy. Religion and polity, however, remained separate domains, and in ordinary times the organizational links between the Sangha and the king were not close. After the fall of Ayutthya, Thailand was reunited by
King Taksin under the
Kingdom of Thonburi, but he was overthrown in 1782 by
Rama I. == Modern history ==