Who defeated the Maurya dynasty?

Following Ashoka’s death, a series of weak kings ruled the Mauryan Empire for 50 years that led to the erosion of the central authority of the Mauryas. Eventually the dynasty was deposed in 185 BC when Pushyamitra Sunga led a successful coup leading to the formation of the Sunga Dynasty

For further reading check the following articles:

• Mauryan Empire
• The decline of the Mauryan Empire
• Emperor Ashoka
• Ashoka’s Edicts