Ayutthaya Kingdom in the context of "Bangkok"

A tributary state is a pre-modern state in a particular type of subordinate relationship to a more powerful state which involved the sending of a regular token of alliance, or tribute, to the superior power (the suzerain). This token often took the form of a substantial transfer of wealth, such as the delivery of gold, produce, or slaves, so that tribute might best be seen as the payment of protection money. It might also be more symbolic: sometimes it amounted to no more than the delivery of a mark of alliance such as the bunga mas (golden flower) that rulers in the Malay Peninsula used to send to the kings of Siam, or the Tribute of the Maltese Falcon that the Grand Master of the Order of St. John used to send annually to the Viceroy of Sicily in order to rule Malta. It might also involve attendance by the subordinate ruler at the court of the hegemon in order to make a public show of submission.

The modern-day heirs of tribute hegemons tend to claim that the tributary relationship should be understood as an acknowledgement of the hegemon's sovereignty in the modern world, whereas former tributary states deny that there was any transfer of sovereignty.

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 bunga emas dan perak (lit. "golden and silver flowers", Thai: ต้นไม้เงินต้นไม้ทอง RTGS: ton mai ngoen ton mai thong), often abbreviated to bunga mas (Jawi: بوڠا مس‎ "golden flowers"), was a form of tribute sent every three years to the king of Ayutthaya (Siam) from its vassal states in the Malay Peninsula, in particular, Terengganu, Kelantan, Kedah, Pattani, Nong Chik, Yala, Rangae, Kubang Pasu and Setul. The tribute consisted of two small trees made of gold and silver, along with costly gifts of weapons, goods and slaves.

According to a Kedahan source, the first time a bunga mas was sent, it was sent as a toy for a new-born Siamese prince who was the grandson of Sultan of Kedah himself since his kin, a princess was married to the Siamese king. The rulers of Kedah in the 17th-century considered it to be a token of friendship. However Siamese kings since instead maintained that it was a recognition of their suzerainty.

The history of the modern state of Singapore dates back to its founding in the early 19th century; however, evidence suggests that a significant trading settlement existed on the island in the 14th century. The last ruler of the Kingdom of Singapura, Parameswara, was expelled by the Majapahit or the Siamese before he founded Malacca. Singapore then came under the Malacca Sultanate and subsequently the Johor Sultanate. In 1819, British statesman Stamford Raffles negotiated a treaty whereby Johor would allow the British to locate a trading port on the island, ultimately leading to the establishment of the Crown colony of Singapore in 1867. Important reasons for the rise of Singapore were its nodal position at the tip of the Malay Peninsula flanked by the Pacific and Indian Oceans, the presence of a natural sheltered harbour, as well as its status as a free port.

During World War II, Singapore was invaded and occupied by the Japanese Empire from 1942 to 1945. When the Japanese surrendered, Singapore reverted to British control, with increasing levels of self-government being granted, resulting in Singapore's merger with the Federation of Malaya to form Malaysia in 1963. However, social unrest, racial tensions, and political differences between Singapore's governing People's Action Party (PAP) and Malaysia's Alliance Party resulted in Singapore's expulsion from Malaysia. Singapore became an independent republic on 9 August 1965.

The Khmer Empire was an empire in mainland Southeast Asia, centered on hydraulic cities in what is now northern Cambodia. Known as Kambuja (Old Khmer: កម្វុជ; Khmer: កម្ពុជ) by its inhabitants, it grew out of the former civilization of Chenla and lasted from 802 to 1431. Historians call this period of Cambodian history the Angkor period, after the empire's most well-known capital, Angkor. The Khmer Empire ruled or vassalised most of Mainland Southeast Asia and stretched as far north as southern China.

The beginning of the Khmer Empire is conventionally dated to 802, when Khmer prince Jayavarman II declared himself chakravartin (lit. 'universal ruler', a title equivalent to 'emperor') in the Phnom Kulen mountains. Although the end of the Khmer Empire has traditionally been marked with the fall of Angkor to the Siamese Ayutthaya Kingdom in 1431, the reasons for the empire's collapse are still debated amongst scholars. Researchers have determined that a period of strong monsoon rains was followed by a severe drought in the region, which caused damage to the empire's hydraulic infrastructure. Variability between droughts and flooding was also a problem, which may have caused residents to migrate southward and away from the empire's major cities.

The post-Angkor period of Cambodia (Khmer: ប្រទេសកម្ពុជាក្រោយសម័យអង្គរ), also called the Middle period, refers to the historical era from the early 15th century to 1863, the beginning of the French protectorate of Cambodia. As reliable sources (for the 15th and 16th centuries, in particular) are very rare, a defensible and conclusive explanation that relates to concrete events that manifest the decline of the Khmer Empire, recognised unanimously by the scientific community, has so far not been produced. However, most modern historians have approached a consensus in which several distinct and gradual changes of religious, dynastic, administrative and military nature, environmental problems and ecological imbalance coincided with shifts of power in Indochina and must all be taken into account to make an interpretation. In recent years scholars' focus has shifted increasingly towards human–environment interactions and the ecological consequences, including natural disasters, such as flooding and droughts.

Stone epigraphy in temples, which had been the primary source for Khmer history, is already a rarity throughout the 13th century, ends in the third decade of the fourteenth, and does not resume until the mid-16th century. Recording of the Royal Chronology discontinues with King Jayavarman IX Parameshwara (or Jayavarma-Paramesvara), who reigned from 1327 to 1336. There exists not a single contemporary record of even a king’s name for over 200 years. Construction and maintenance of monumental temple architecture had come to a standstill after Jayavarman VII's reign. According to author Michael Vickery there only exist external sources for Cambodia’s 15th century, the Chinese Ming Shilu ("Veritable Records") and the earliest Royal Chronicle of Ayutthaya, which must be interpreted with greatest caution.

Angkor (Khmer: អង្គរ [ʔɑŋkɔː], lit. 'capital city'), also known as Yasodharapura (Khmer: យសោធរបុរៈ; Sanskrit: यशोधरपुर), was the capital city of the Khmer Empire, located in present-day Cambodia. The city and empire flourished from approximately the 9th to the 15th centuries. The city houses the Angkor Wat, a temple complex that is one of Cambodia's most popular tourist attractions.

The name Angkor is derived from nokor (នគរ), a Khmer word meaning "kingdom" which in turn derived from Sanskrit nagara (नगर), meaning "city". The Angkorian period began in AD 802, when the Khmer Hindu monarch Jayavarman II declared himself a "universal monarch" and "god-king", and lasted until the late 14th century, first falling under Ayutthayan suzerainty in 1351. A Khmer rebellion against Siamese authority resulted in the 1431 sacking of Angkor by Ayutthaya, causing its population to migrate south to Longvek. The alternate name, Yasodharapura, was derived from the name of the foster mother of Lord Krishna in Hinduism. Hinduism was the largest religion in the ancient Khmer Empire, and many temples were constructed by Khmer kings dedicated to Hindu deities, including Angkor Wat.

The Sukhothai Kingdom was a post-classical Siamese kingdom (maṇḍala) in Mainland Southeast Asia surrounding the ancient capital city of Sukhothai in present-day north-central Thailand. It evolved from a trading hub to a city-state in 1127 and emerged into the kingdom by Si Inthrathit in 1238. Sukhothai existed as an independent polity until 1438 when it fell under the influence of the neighboring Ayutthaya after the death of Borommapan (Maha Thammaracha IV).

Sukhothai was originally a trade center in Lavo—itself under the suzerainty of the Khmer Empire from 946–1052—when Central Thai people led by Pho Khun Bang Klang Hao, a local leader, revolted and gained their independence. Bang Klang Hao took the regnal name of Si Inthrathit and became the first monarch of the Phra Ruang dynasty.