Like in other parts of India, the Bhakti movement also spread into the eastern regions in the early sixteenth century, and had brought a large section of the people under its banner stretching from Koch Behar in the west in North Bengal to the foothills of Arunachal Pradesh in the eastern frontier. The present work is a comprehensive, but a critical history of the growth and development of the mystical movement in this part of India from the early sixteenth to seventeenth century with special reference to the M?y?mar? sect, which claims to be nirguna in its essence, teachings, social ideology, and political influence. While doing this, the book has re-examined the theory that bhakti movement ultimately failed to usher in a democratic outlook and egalitarian aspects as it had originally proposed, and that it had ultimately submitted to the strong and dominant conservative forces.