It is believed that Assamese culture developed its roots over 750 years as the country of Kamarupa during the first millennium AD of Bodo-Kachari people assimilation with Aryan which is debatable as the idea of Assam as an entity was not present. The first 300 years of Kamarupa was under the great Varman dynasty, 250 years under the Mlechchha dynasty and 200 years under the Pala dynasty. The records of many aspects of the language, traditional crafts (silk, lace, gold, bronze, etc.) are available in different forms. When the Tai-Shans entered the region in 1228 under the leadership of Sukaphaa to establish Ahom kingdom in Assam for the next 600 years, again a new chapter of cultural assimilation was written, and thus the modern form of Assamese culture developed. The original Tai-Shans assimilated with the local culture adopted the language on one hand and on the other also influenced the culture with the elements from their own. Similarly, the Chutiya kingdom in eastern Assam, the Koch Kingdom in western Assam and the medieval Kachari and Jaintia kingdoms in southern Assam provided stages for assimilation at different intensities and with different cultural-mixes.