Davaka
Davaka was a kingdom of ancient Indian subcontinent, located in current central region of Assam state. The references to it comes from the 4th century Allahabad pillar inscription of Samudragupta, where it is mentioned as one of five frontier kingdoms of the Gupta Empire; the Shung-Shu History of the Liu Song dynasty, where the kingdom is named Kapili ; the Gachtal stone pillar inscription written in Kamrupi Prakrit. N K Bhattasali has identified it with Dabaka in modern Nagaon district, with the kingdom associated with the Kopili-Kolong river valley.
In 4th-century Davaka was mentioned as frontier kingdom with Kamarupa in the Samudragupta's Prayaga stone inscription, which was later absorbed by 6th or 7th century by western kingdom of Kamarupa, though later historians like B N Puri and P C Choudhury claim that it was absorbed much earlier in the first half of the 5th century during the reign of Kalyana Varman.
Its capital was located near Kapili river. In the year 428 A.D, an embassy was sent to China by Davaka king, whose name according to Chinese sources is Yuegnai or Yu Chai.
