Answer: Vasudeva
Notes: Vasudeva was the emperor who overthrew the last ruler of Shunga dynasty. The last ruler of shunga dynasty was Devabhuti. Vasudeva was a ruler of Kanva dynasty. The Kanva dynasty or Kanvayana was a Brahmin dynasty in Magadha and ruled in the Eastern part of India from 75 BC. to 30 BC. Magadha was ruled by four Kanva rulers.
