The last king of the Shunga dynasty, who was killed by his own minister, was:

Devabhuti was the last ruler of the Shunga dynasty; according to the Puranas and Banabhatta's "Harshacharita", he was killed by his own minister, who then founded a new dynasty, around 73 BCE.

About Devabhuti:

• He ruled for about ten years.
• According to the "Harshacharita", he was a pleasure-loving king, who was killed by a slave girl disguised as a queen, at the instigation of his minister.
• His minister then established the Kanva dynasty, which ruled Magadha for about 45 years.

About the Shunga dynasty:

• It was founded by Pushyamitra Shunga around 185 BCE, after he assassinated the last Mauryan king, Brihadratha.
• It ruled from about 185 BCE to 73 BCE, from Pataliputra and later from Vidisha.

Important rulers:

• Pushyamitra Shunga: the founder; he performed two Ashvamedha sacrifices; he fought the Indo-Greeks and the Kalinga king.
• Agnimitra: the son of Pushyamitra; he was the governor of Vidisha, and is the hero of Kalidasa's play "Malavikagnimitra".
• Vasumitra: the grandson of Pushyamitra, who defeated the Greeks on the banks of the Sindhu river, according to Kalidasa.
• Devabhuti: the last ruler.

Shunga art:

• The Shunga period saw important developments in art, such as the expansion of the Sanchi stupa, and Buddhist railings and gateways at other sites.
• Terracotta figurines of the Shunga period are well known.

The Kanva dynasty:

• It ruled Magadha from about 73 BCE to 28 BCE.
• It was overthrown by the Satavahanas (according to the Puranas).

Why not the other options?

• ✗Agnimitra was the son of Pushyamitra.
• ✗Vasumitra was the grandson of Pushyamitra.
• ✗Pushyamitra was the founder of the dynasty.