Anandamath.

The lesser known 'Sannyasi Rebellion' of the 18th century forms the base of this film. Bankimchandra Chattopadhyay's 'Anandamath' is regarded as one of the most significant patriotic novels that fueled the national movement. India's national song 'Vande Mataram' was actually taken from this novel, which was once banned by the British rulers.