This was the most important win, as Jarasandha had several allies in the region, including Shishupala and Bhagadatta.
Krishna married Rukmini by abducting her from the Vidarbha kingdom, though Rukmi wanted to give her as bride to Chedi king Shishupala.
:: 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.
Meanwhile, Shishupala was overjoyed at the news from Rukmi that he could simply go to Kundina (present day Koundanyapur) Amravati district and claim Rukmini.
The Marathi writer Bhaskarabhatta Borikar, of the early 14th century, wrote a Shishupala Vadha in Marathi (1308).
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Finally, Krishna enters the fight (Canto XX), and after a long battle, strikes off Shishupala's head with Sudarshana Chakra, his discus.