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Davaka was a kingdom of ancient Indian subcontinent, located in current central region of 
Other references are the Shung-Shu History of the
Assam
Assam (; ) is a state in northeastern India, south of the eastern Himalayas along the Brahmaputra and Barak River valleys. Assam covers an area of . The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur ...
state. The references to it comes from the 4th century Allahabad pillar inscription of Samudragupta
Samudragupta ( Gupta script: ''Sa-mu-dra-gu-pta'', (c. 335–375 CE) was the second emperor of the Gupta Empire of ancient India, and is regarded among the greatest rulers of the dynasty. As a son of the Gupta emperor Chandragupta I and the ...
, where it is mentioned as one of five frontier kingdoms of the Gupta Empire
The Gupta Empire was an ancient Indian empire which existed from the early 4th century CE to late 6th century CE. At its zenith, from approximately 319 to 467 CE, it covered much of the Indian subcontinent. This period is considered as the Go ...
.
Other references are the Shung-Shu History of the Liu Song dynasty
Song, known as Liu Song (), Former Song (前宋) or Song of (the) Southern Dynasty (南朝宋) in historiography, was an imperial dynasty of China and the first of the four Southern dynasties during the Northern and Southern dynasties period ...
, where the kingdom is named ''Kapili'' (now the name of a river); the Gachtal stone pillar inscription written in Kamrupi Prakrit
Kamarupi Prakrit is the postulated Middle Indo-Aryan (MIA) Prakrit language used in ancient Kamarupa (5th–13th century). This language is the historical ancestor of the Kamatapuri lects and the modern Assamese language;"In this study I ...
. N. K. Bhattasali has identified it with Dabaka in modern Hojai district, with the kingdom associated with the Kopili- Kolong river valley.
Historians such as B. N. Puri (1968) and P. C. Choudhury (1959) claim that it was absorbed much earlier in the first half of the 5th century during the reign of Kalyana Varman (422–446).
Its capital was located near Kopili river. In the year 428 AD, an ambassador was sent to China by Davaka king, whose name according to Chinese sources is Yuegnai or Yu Chai.
Gatchal Stone Pillar inscription mention that the Yava