Explanation:

The ancient era of Assam History began in the 4th century with the mention of 'Kamrupa' in Samdragupta's Allahabad Pillar and with the establishment of Kamrupa kingdom. The following dynasties/kings ruled the Kamrupa kingdom-
(i) The Varmana Dynasty

(ii) The Salasthmbha or Mlechchha Dynasty

(iii) Pala Dynasty

(iv) Non-dynastic independent Kings