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Ans.
Samudragupta's 4th century Allahabad pillar inscription mentions Kamarupa (Western Assam) 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.
Ruled by three dynasties Varmanas (c. 350–650 CE), Mlechchha dynasty (c.655–900 CE) and 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 their descent from Narakasura, an immigrant from Aryavarta.[citation needed] In the reign of the Varman king, Bhaskar Varman (c. 600–650 CE), the Chinese traveller Xuanzang visited the region and recorded his travels. Later, after weakening and disintegration (after the Kamarupa-Palas), the Kamarupa tradition was somewhat extended till c. 1255 CE by the Lunar I (c. 1120 – 1185 CE) and Lunar II (c. 1155 – 1255 CE) dynasties.