Tboung Khmum Kingdom

Tboung Khmum Kingdom (Khmer: ត្បូងឃ្មុំ [tɓoːŋ kʰmum]) was a former political entity of the Kuy people^: 21 that existed around the 14th to 16th centuries in the central Mekong Valley, covering some parts of present-day northeast Cambodia, southern Laos, and northeastern Thailand. Its capital was annexed by Cambodia in the 16th century,^: 37 while the remaining communities in the north evolved into the multi-ethnolinguistic polities that later became part of Laos and Thailand.^{: 37–38 : 1–4, 11–12}

Records of the Tboung Khmum Kingdom are limited. The only surviving evidence is the Longvek Chronicle, written by the Khmer king Ang Eng,^: 27–28 and it is sporadically mentioned in the Siamese royal text in the Ayutthaya and early Rattanakosin periods.^: 37–38 Preah Vihear province of Cambodia, which was previously the center of the Kuy Kingdom, formerly held a much denser population than today. The Preah Vihear Temple is one of the significant sites built in the 9th–10th centuries by the Kuy people,^: 146 It was almost certainly from them that the Khmers wrested the land lying to the west of the Mekong and northeast of the great inland lake (Thale Sap).^: 147