Haan bhai.... Meri history thodi week hai.... But janha tk mujhe malum hai.... Bengal sai pehale magadh Tha.... Or yanha ka capital Patliputra. Or yanha sai suru hua tha jain and Buddha ka time....bihar ka naam bihar isiliye hai kuki Buddhist janha ja kar group ya hindi mai ekatrit hote hai ushe Vihar kehte the.... So Vihar sai bihar bna..... Ye Meri knowledge ke hisab sai..... Baki jo history nai knowledge rakhte hai wo apko pura bata denge.