Explanation:

 Chutiya kingdom was the largest kingdom in Assam after the fall of Kamrupa and before the rise of Ahom kingdom. Chutiya chieftains/rajas (who ruled Upper Assam and Arunachal) and initially ruled parts of present-day Arunachal Pradesh. Over the years he and his successors united all the hill and plain Chutiya kings of Assam as well as Arunachal Pradesh to form the greater Chutiya kingdom after the fall of Pala dominance.