Sukhothai Kingdom in the context of "Post-classical"

Thailand, officially the Kingdom of Thailand, and formerly known as Siam until 1939, is a country located in mainland Southeast Asia. It shares land borders with Myanmar to the west and northwest, Laos to the east and northeast, Cambodia to the southeast, and Malaysia to the south. Its maritime boundaries include the Gulf of Thailand and the Andaman Sea, as well as maritime borders with Vietnam, Indonesia, and India. Thailand has a population of nearly 66 million people, covers an area of approximately 513,115 km (198,115 sq mi). The country's capital and largest city is Bangkok.

Archaeological evidence indicates that humans have inhabited the area of present-day Thailand for at least 40,000 years. Indigenous ethnic groups include the Mon, Khmer, and Malay people. The Tai people are believed to have originated from the Điện Biên Phủ region since the 5th century and began migrating into the territory of modern Thailand between the 8th and 10th centuries origin of the Tai people. During the classical historical period, major kingdoms such as Sukhothai, Lan Na, and Ayutthaya were established. The Sukhothai Kingdom is regarded as the beginning of Thai history, while the Ayutthaya Kingdom, founded in 1350 CE, became a regional power replacing the Khmer Empire. European contact began in 1511 CE when Portuguese envoys arrived in Ayutthaya. The Ayutthaya Kingdom flourished until its complete destruction during the 1765–1767 Burmese–Siamese War by the Burmese forces under the Konbaung dynasty in 1767.

The Ayutthaya Kingdom or the Empire of Ayutthaya was a Thai kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Ayutthaya, in Siam, or present-day Thailand. European travellers in the early 16th century called Ayutthaya one of the three great powers of Asia (alongside Vijayanagara and China), although the Chinese chronicles recognise the kingdom as one of its tributary states. The Ayutthaya Kingdom is considered to be the precursor of modern Thailand, and its developments are an important part of the history of Thailand.

The name Ayutthaya originates from Ayodhya, a Sanskrit word. This connection stems from the Ramakien, Thailand's national epic. The Ayutthaya Kingdom emerged from the mandala or merger of three maritime city-states on the Lower Chao Phraya Valley in the late 13th and 14th centuries (Lopburi, Suphanburi, and Ayutthaya). The early kingdom was a maritime confederation, oriented to post-Srivijaya Maritime Southeast Asia, conducting raids and tribute from these maritime states. After two centuries of political organization from the Northern Cities and a transition to a hinterland state, Ayutthaya centralized and became one of the great powers of Asia. From 1569 to 1584, Ayutthaya was a vassal state of Toungoo Burma; but quickly regained independence. In the seventeenth and eighteenth centuries, Ayutthaya emerged as an entrepôt of international trade and its cultures flourished. The reign of Narai (r. 1657–1688) was known for Persian and later, European, influence and the sending of the 1686 Siamese embassy to the French court of King Louis XIV. The Late Ayutthaya Period saw the departure of the French and English but growing prominence of the Chinese. The period was described as a "golden age" of Siamese culture and saw the rise in Chinese trade and the introduction of capitalism into Siam, a development that would continue to expand in the centuries following the fall of Ayutthaya.

The 13th century was the century which lasted from January 1, 1201 (represented by the Roman numerals MCCI) through December 31, 1300 (MCCC) in accordance with the Julian calendar.

The Mongol Empire was founded by Genghis Khan, which stretched from Eastern Asia to Eastern Europe. The conquests of Hulagu Khan and other Mongol invasions changed the course of the Muslim world, most notably the Siege of Baghdad (1258) and the destruction of the House of Wisdom. Other Muslim powers such as the Mali Empire and Delhi Sultanate conquered large parts of West Africa and the Indian subcontinent, while Buddhism witnessed a decline through the conquest led by Bakhtiyar Khilji. The earliest Islamic states in Southeast Asia formed during this century, most notably Samudera Pasai. The Kingdoms of Sukhothai and Hanthawaddy would emerge and go on to dominate their surrounding territories.

Mass migration of Tai peoples from China (Guangxi) to Mainland Southeast Asia and Northern Thailand occurred between the 8th-10th century. The Mainland region was ruled by the Khmer Empire since 800 CE. The Thai established their own kingdoms: the semi-legendary Singhanavati Kingdom (691 BCE–638 CE) evolved into the Ngoenyang Kingdom (638–1292). In 1220, the Khmer controlled Sukhothai was conquered by the Thais and made the capital of the Sukhothai Kingdom. By 1220, the long declining Khmer Empire was mostly overrun by Thais. By the 13th century, the Sukhothai Kingdom (1238–1438) had replaced the Mon kingdoms in Central Thailand. During the reign of King Ramkhamhaeng the Thai script was created in 1283, the arts flourished, Thai institutions were developed, and people called themselves "Thai" as freed people from foreign rule.

In 1351, the Suphannabhum city-state (modern-day Suphan Buri), and Lavo city-state (modern-day Lop Buri) merged into the Ayutthaya Kingdom which was founded near the Chao Phraya River. Duarte Fernandes was the first European to arrive in Ayutthaya in 1511. Siam became the popular international name for Thailand.

Northern Thailand the oldest region in Thailand the main ethnic group Tai-Lue established their own kingdoms: the semi-legendary Singhanavati Kingdom (691 BCE–638 CE) evolved into the Ngoenyang Kingdom (638–1292). In 1220, the Khmer controlled Sukhothai was conquered by the Thais and made the capital of the Sukhothai Kingdom. By 1220, the long declining Khmer Empire was mostly overrun by Thais. By the 13th century, the Sukhothai Kingdom (1238–1438) had replaced the Mon kingdoms in Central Thailand. During the reign of King Ramkhamhaeng the Thai script was created in 1283, the arts flourished, Thai institutions were developed, and people called themselves "Thai" as freed people from foreign rule.

In 1351, the Suphannabhum city-state (modern-day Suphan Buri), and Lavo city-state (modern-day Lop Buri) merged into the Ayutthaya Kingdom (Tai-Lue from the Northern+Monic from Chao Phra Ya river basin = Siamese Kingdom) which was founded near the Chao Phraya River. Duarte Fernandes was the first European to arrive in Ayutthaya in 1511.

Tambralinga or Ho-ling was an Indianised Malay kingdom located on the Malay Peninsula (in modern-day Southern Thailand), existing at least from the 2nd to 13th centuries CE. It possibly was under the influence of Srivijaya for some time, but later became independent from it or were generally allies rather than conqueror and vassal. The name had been forgotten until scholars recognized Tambralinga as Nakhon Si Thammarat (Nagara Sri Dharmaraja). In Sanskrit and Prakrit, tām(b)ra means "copper", "copper-coloured" or "red" and linga means "symbol" or "creation", typically representing the divine energy of Shiva.

Tambralinga first sent an embassy to China under the Song dynasty in 1001. In the 12th century it may or may not have been under the suzerainty of the Burmese Pagan Kingdom and a kingdom of Sri Lanka. At its height in the mid-13th century, under King Chandrabhanu, Tambralinga was independent, regrouping and consolidating its power and even invading Sri Lanka. By the end of the 13th century, Tambralinga was recorded in Siamese history as Nakhon Si Thammarat, under the suzerainty of the Tai Sukhothai Kingdom.

The Nakhon Si Thammarat Kingdom (Thai: อาณาจักรนครศรีธรรมราช RTGS: Anachak Nakhon Si Thammarat), Nagara Sri Dharmaraja or the Kingdom of Ligor, was one of the major constituent city states (mueang) of the Siamese kingdoms of Sukhothai and later Ayutthaya and controlled a sizeable part of the Malay Peninsula. Its capital was the eponymous city of Nakhon Si Thammarat in what is now Southern Thailand.

The monarchy of Thailand is the constitutional form of government of Thailand (formerly Siam). The king of Thailand (Thai: พระมหากษัตริย์ไทย, historically, king of Siam; Thai: พระเจ้ากรุงสยาม) is the head of state and head of the ruling Chakri dynasty.

Although the current Chakri dynasty was created in 1782, the existence of the institution of monarchy in Thailand is traditionally considered to have its roots in the founding of the Sukhothai Kingdom in 1238, with a brief interregnum from the death of Ekkathat to the accession of Taksin in the 18th century. The institution was transformed into a constitutional monarchy in 1932 after the bloodless socialist-leaning Siamese Revolution of 1932. The monarchy's official ceremonial residence is the Grand Palace in Bangkok, while the private residence has been at the Dusit Palace. The king of Thailand is head of state, Highest Commander of the Royal Thai Armed Forces, adherent of Buddhism and upholder of religions.