তাই আহোম: Tai Ahom of Assam Northeastern India. Tai-Ahom is an ethnic group from the Indian states of Assam and Arunachal Pradesh. They are the admixed descendants of the Tai people who reached the Brahmaputra valley of Assam in 1228 and the local indigenous people who joined them over the course of history. Sukaphaa, the leader of the Tai group and his 9000 followers established the Ahom kingdom (1228–1826 CE), which controlled much of the Brahmaputra Valley in modern Assam until 1826.