Siam Confederation, Xiān or Siam was a confederation of maritime-oriented port polities along the present Bay of Bangkok, including Ayodhya, Suphannabhum, and Phrip Phri, as well as Nakhon Si Thammara
Image in the Angkor Wat, dated to the early 12th century, shows Siamese mercenaries led by a noble from the city of Cheng Shan (เชงฌาล), who later became a major rival of the Angkor.
Phip Phli Kingdom in 1196, one of the Xian states.
Syamapura Kingdom or Bàn Zhī Bá, or Gàn Zhī Fú, was a medieval polity located in the Southwest Sea region, with its political center at Si Thep in the Pasak Basin of central Thailand. To the north, it
Khao Khlang Nok, one of the largest known ancient Dvaravati structures in Si Thep, 7th–8th century CE
Pali inscription in Pallava script on a piece of artifact found in the moated settlement of Si Thep
Prang Si Thep, constructed in Angkorian architectural style during the late Dvaravati period, c. 12th century.