<Li> Pundra Kingdom, c. 700--c. 200 BCE </Li> <Li> Bengal in Mahabharata, c. 400--c. 325 BCE </Li> <Li> Gangaridai Kingdom, c. 350--c. 325 BCE </Li> <Li> Mauryan Empire, c. 325--c. 185 BCE </Li>

The annulment of partion of bengal was done by