Tboung Khmum Kingdom (Khmer: ត្បូងឃ្មុំ [tɓoːŋ kʰmum]) was a former political entity of the Kuy people[1]: 21 [2] that existed around the 14th to 16th centuries in the central Mekong Valley,[2] covering some parts of present-day northeast Cambodia, southern Laos, and northeastern Thailand.
[2] Its capital was annexed by Cambodia in the 16th century,[3]: 37 while the remaining communities in the north evolved into the multi-ethnolinguistic polities that later became part of Laos and Thailand.
The only surviving evidence is the Longvek Chronicle, written by the Khmer king Ang Eng,[1]: 27–28 and it is sporadically mentioned in the Siamese royal text in the Ayutthaya and early Rattanakosin periods.
[5]: 101 The latter part of the chronicle mentions the struggle for the throne by the Khmer royal family after the death of King Noreay Ramathuppdey [fr] in 1468.
[4]: 1–4, 11–12 Meanwhile, the Kuy communities in the Mun River basin in the west were loyal to Ayutthaya, with Phimai as the head of the region,[3]: 37–38 and it was collectively called in the Rattanakosin period as Hua Mueang Khamen Pa Dong (หัวเมืองเขมรป่าดง), which can be interpreted as meaning "cities of the Khmer forest people.