Assam has a mixed culture due to assimilation of Aryan and non Aryan
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The 8th- to 6th-century BCE text, Shatapatha Brahmana, describes the Sanskritization of East India up to the Karatoya river, the western boundary of the historic Kamarupa kingdom.[4] The Aitareya Brahmana indicated spread of Aryan culture to ancient Assam, Gopatha Brahmana narrates origin of name 'Kamarupa' and Sankhyayana Grihasamgraha describes 'Pragjyotisha' as the land of sunrise.[5]
Archaeologically, the Northern Black Polished Ware, a pottery style associated with the development of the first large states in Northern India, reached the Karatoya only by the 2nd century BCE.[6] The sanskritization of Assam cannot thus be pushed beyond the 6th century BCE.[7] It is also significant that neither early Buddhist sources,[6] nor Ashokan epigraphs[8] (3rd century BCE with the capital in East India) mention the Assam region. The Periplus of the Erythraean Sea (1st century CE) and Ptolemy's Geography (2nd century CE) refer to the Cachar of Barak Valley in Assam, Sylhet and Tripura as Kirrhadia, after the Kirata people (non-Indo-Aryan).[9][10] A reference to Lauhitya in Kautilya's Arthashastra is identified by commentators with the Brahmaputra Valley,[11] though the Arthashastra in its current form is dated to the early centuries of CE, and the commentaries to even later.[12]
It appears that the Assam region became a punya bhumi, a region that did not require a Hindu purification ceremony, by the post Gupta period (320-550 CE).[13]
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