Samudragupta's 4th century Allahabad pillar inscription mentions Kamarupa and Davaka (Central Assam) as frontier kingdoms of the Gupta Empire.

Davaka was later absorbed by Kamarupa, which grew into a large kingdom that spanned from Karatoya river to near present Sadiya and covered the entire Brahmaputra valley, North Bengal, parts of Bangladesh and, at times Purnea and parts of West Bengal.

The kingdom was ruled by three dynasties who traced their lineage from a mleccha or Kirata Naraka; the Varmanas (c. 350–650 CE), the Mlechchha dynasty (c.655–900 CE) and the Kamarupa-Palas (c. 900–1100 CE), from their capitals in present-day Guwahati (Pragjyotishpura), Tezpur (Haruppeswara) and North Gauhati (Durjaya) respectively.
All three dynasties claimed descent from Narakasura.

In the reign of the Varman king, Bhaskaravarman (c. 600–650 AD), the Chinese traveller Xuanzang visited the region and recorded his travels.
Later, after weakening and disintegration (after the Kamarupa-Palas), the Kamarupa tradition was extended to c. 1255 AD by the Lunar I (c. 1120–1185 AD) and Lunar II (c. 1155–1255 AD) dynasties.
Samudragupta's 4th century Allahabad pillar inscription mentions Kamarupa and Davaka (Central Assam) as frontier kingdoms of the Gupta Empire.
Davaka was later absorbed by Kamarupa, which grew into a large kingdom that spanned from Karatoya river to near present Sadiya and covered the entire Brahmaputra valley, North Bengal, parts of Bangladesh and, at times Purnea and parts of West Bengal.
The kingdom was ruled by three dynasties who traced their lineage from a mleccha or Kirata Naraka; the Varmanas (c. 350–650 CE), the Mlechchha dynasty (c.655–900 CE) and the Kamarupa-Palas (c. 900–1100 CE), from their capitals in present-day Guwahati (Pragjyotishpura), Tezpur (Haruppeswara) and North Gauhati (Durjaya) respectively. All three dynasties claimed descent from Narakasura.
In the reign of the Varman king, Bhaskaravarman (c. 600–650 AD), the Chinese traveller Xuanzang visited the region and recorded his travels. Later, after weakening and disintegration (after the Kamarupa-Palas), the Kamarupa tradition was extended to c. 1255 AD by the Lunar I (c. 1120–1185 AD) and Lunar II (c. 1155–1255 AD) dynasties.
Assam