Xishuangbanna Dai Autonomous Prefecture in the context of "Rattanakosin Kingdom"

The Dai people (Burmese: ရှမ်းလူမျိုး; Tai Lü: ᨴᩱ/ᨴᩱ᩠ᨿ; Lao: ໄຕ; Thai: ไท; Shan: တႆး, [tai˥˩]; Tai Nüa: ᥖᥭᥰ, [tai˥]; Chinese: 傣族; pinyin: Dǎizú) are several Tai-speaking ethnic groups living in the Xishuangbanna Dai Autonomous Prefecture and the Dehong Dai and Jingpo Autonomous Prefecture of China's Yunnan Province. The Dai people form one of the 56 ethnic groups officially recognized by the People's Republic of China. By extension, the term can apply to groups in Laos, Vietnam, Thailand and Myanmar when Dai is used to mean specifically Tai Yai, Lue, Chinese Shan, Tai Dam, Tai Khao or even Tai in general. For other names, see the table below.

The Rattanakosin Kingdom, also known as the Kingdom of Siam after 1855, refers to the Siamese kingdom (in modern-day Thailand) between 1782 and 1932. It was founded in 1782 with the establishment of Rattanakosin (Bangkok), which replaced the city of Thonburi as the capital of Siam. This article covers the period until the Siamese revolution of 1932.

The kingdom governed based on the mandala system. This allows for high-autonomy locally with the kingdom influencing and effectively ruling its area of suzerainty. At its zenith in 1805 to 1812, the Kingdom was composed of 25 polities, ranging from duchies and principalities to federations and kingdoms. With the furthest extent reaching the Shan States, southern Yunnan, Laos, Cambodia, northern Si Rat Malai and Kawthoung. The kingdom was founded by Rama I of the Chakri dynasty. The first half of this period was characterized by the consolidation of Siamese power in the center of Mainland Southeast Asia and was punctuated by contests and wars for regional supremacy with rival powers Burma and Vietnam. The second period was one of engagements with the colonial powers of Britain and France in which Siam remained the only Southeast Asian state to maintain its independence.

Tai Lue (New Tai Lü: ᦅᧄᦺᦑᦟᦹᧉ, Tai Tham: ᨣᩤᩴᨴᩱ᩠ᨿᩃᩨᩢ, kam tai lue, [kâm.tâj.lɯ̀]), or Xishuangbanna Dai, is a Tai language of the Lu people, spoken by about 700,000 people in Southeast Asia. This includes 280,000 people in China (Yunnan), 200,000 in Burma, 134,000 in Laos, 83,000 in Thailand and 4,960 in Vietnam. The language is similar to other Tai languages and is closely related to Kham Mueang or Tai Yuan, which is also known as Northern Thai language. In Yunnan, it is spoken in all of Xishuangbanna Dai Autonomous Prefecture, as well as Jiangcheng Hani and Yi Autonomous County in Pu'er City.

In Vietnam, Tai Lue speakers are officially recognised as the Lự ethnic minority, although in China they are classified as part of the Dai people, along with speakers of the other Tai languages apart from Zhuang.