Hi Dean,

In Kalikapurana is accounted a detailed biography of Naraka that is considered the one who founded the Kamaupa (Hindu[ized]) kingdom.

Guwahati edition of KP, see ch. 36-40

Shastri, B., ed. and trans. (2008) The Kalikapurana: Sanskrit Text with English Translation. Delhi: Nag Publishers. First published 1991, in three volume.

Vankatesvar press ed. (=Bombay ed) ed., should be ch. 37-41

Kulke worked a lot on the foundation of Hindu kingdoms in Eastern India considering the dialectic between the local population and Hindu high castes. You can find useful insights in these publications:

Kulke, Hermann. 1986. "Royal Temple Policy and the Structure of Medieval Hindu Kingdoms". In The Cult of Jagannath and the Regional Tradition of Orissa. Edited by Anncharlotte Eschmann, Hermann Kulke and Gaya C. Tripathi. Delhi: Manhoar, pp. 125–37. First published 1978.

Kulke, Hermann. 1976. "Kshatriyaization and Social Change. A Study in Orissa Setting". In Aspects of Changing India: Studies in Honour of Professor G.S. Ghurye. Edited by S. Devadasa Pillai. Mumbai: Popular Prakashan, pp. 398–409.

Kulke, Hermann. 1992. "Tribal Deities at Princely Courts: The Feudatory Rajas of Central Orissa and Their Tutelary Deities". In Realm of the Sacred: Verbal Symbolism and Ritual Structures. Edited by Sitakant Mahapatra. Calcutta: Oxford University Press, pp. 56–78.

Eschmann, Anncharlott. 1986. "Hinduization of Tribal Deities in Orissa: The Sakta and Saiva Typoloy". In The Cult of Jagannath and the Regional Tradition of Orissa. Edited by Anncharlotte Eschmann, Hermann Kulke and Gaya C. Tripathi. Delhi: Manhoar, pp. 125–37. First published 1978.

Although it focuses on Assam history, maybe it could be of interest the article of Shin:

Shin, Jae-Eun. 2010. “Yoni, Yoginīs and Mahāvidyās: Feminine Divinities from Early Medieval Kāmarūpa to Medieval Koch Behar.” Studies in History 26 (1): 1–29.

I hope it can be of help.

Best,

Paolo