Kumarila Bhatta burnt his body in front of the whole villagers. What was the reason behind this act of his?
As per Shri Shankaracharaya Aur Kumaril Bhatt Ka Jeevan Charitra, Kumaril Bhatt was a great Vedic scholar. In Shastrartha, he could answer the questions raised by Buddhism scholars but couldn't raise questions due to less knowledge of their philosophy. To overcome from this problem, he went to Buddhism and Jainism scholars to learn about their philosophy in detail. As he wanted that knowledge only to spread Vedic Dharma so went against their philosophy later on.
But, he considered this act (going against his Buddhism and Jainism Gurus in his mission to spread Vedic Dharma) a sin and to free himself from the sin he decided to take Agni-Samadhi by burning himself on a pile of rice/peanut shells.