This kingdom was visited by Bhima during his military campaign to the east, to collect tribute for Yudhisthira's Rajasuya sacrifice;- After conquering Vatsabhumi Bhima defeated the king of the Bhargas, as also the ruler of the Nishadas viz Manimat and numerous other kings (2,29).
:: The sub-parva describes how and why Krishna first refuses to fight Shishupala, but finally kills him in the assembly hall during the Rajasuya yagna.