Magadha was a kingdom ruled by Vedic civilization kings.
Jarasandha was the greatest among them during epic times. His capital was
Rajagriha or
Rajgir a modern hill resort in
Bihar. Jarasandha's continuous assault on the
Yadava kingdom of
Surasena resulted in their withdrawal from central India to western India. Jarasandha was a threat not only for Yadavas but also for
Kurus. Pandava
Bhima killed him in a wrestling duel. Thus Yudhishthira, the Pandava king, could complete his campaign of bringing the whole of Indian kingdoms to his sway, release the imprisoned kings and start his preparations for the Rajsuya sacrifice.