Nanda Empire
Chanakya, a Brahmin philosopher, who was insulted by him due to public misbehavior, vowed to overthrow him, and raised an army that eventually conquered the Nanda capital Pataliputra and defeated him. Chanakya then installed his own protege Chandragupta Maurya on the throne, an event which marked the fall of the Nanda Empire and the birth of the Mauryan Empire.