The Santhal Rebellion (also known as Santhal Hul), which took place in 1855-56 in the Santhal Parganas region, was primarily led by four Murmu brothers: Sidhu (Sindhu), Kanhu, Chand, and Bhairav. They organized the Santhal people against exploitation by landlords (zamindars), moneylenders (mahajans), and corrupt officials.