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, lac, 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. The Vaishanav Movement, a 15th-century religio-cultural movement under the leadership of Srimanta Sankardeva and his disciples, have provided another dimension to Assamese culture. A renewed Hinduisation in local forms took place, which was initially greatly supported by the Koch and later by the Ahom Kingdoms. The resultant social institutions such as "namghar" and "sattra" - "the Vaishnav Hermitage" have become part of the Assamese way of life. The movement contributed greatly towards language, literature and performing and fine arts. On many occasions, the Vaishnav Movement attempted to introduce alien cultural attributes and modify the way of life of the common people. "Brajavali", a language specially created by introducing words from other Indian languages, failed as a language but left its traces on the Assamese language. Moreover, new alien rules were also introduced changing people's food habits and other aspects of cultural life. This had a greater impact on the alienation of many loethnoculturalural and political groups in the later periods. During periods when strong politico-economic systems that emerged under powerful dynasties, greater cultural assimilation created common attributes of Assamese culture, while under less powerful politico-economic systems or during political disintegration, more localised attributes were created with spatial differentiation. Time-factors for such integrations differentiations have also played an important role along with the position of individual events in the entire series of events.