Sidhu Manjhi was the principal leader of the Santhal Revolt, a major rebellion by the Santhal tribe against the British East India Company and local Zamindars from 1855-56. This uprising, also known as the Santhal Hool, occurred in the area now within Jharkhand, India. Sidhu Manjhi and his brother Kanhu were instrumental in mobilizing and directing the Santhal people. The revolt stands as one of the earliest tribal resistances against British colonial governance, demonstrating the opposition of indigenous groups to their exploitation and mistreatment.