Jarasandha Vadha

Jara( old age, decay) was an old demoness. Bitter and desperate, scavenging for food once day, she came upon two parts of a baby lying in different parts of a forest.. it was more than she expected, she was about to settle down to make a meal of them, when some curiosity/compassion make her bring the two pieces closer together. A infant started bawling before her. She recognised, from some sign that this was the king's child and took the child across, maybe out of compassion for the king, maybe hoping to also get a reward that would make the hunting and scavenging that was difficult in her old age, un necessary

The king beamed to see his son and named him Jarasandha- joined by Jara. The childless king of Magadha had longed for a son, through an elaborate prayer he had been granted a boon- a mango, bearing the assurance of fertility. The king who loved both his queens equally, gave each of them half a mango. The attendants of each queen had thrown the strange half child born to each, out into the forest.

Jarasandha, the fleeting hope of old age and decay, ruled over the powerful kingdom of Kashi. Feeling the vulnerability within, he made himself stronger without. He built mighty fortifications to his city, he lived as a powerful man, bore children, made alliances. He married his two daughters to Kansa, king of Mathura, that ran along his borders.

Then Kansa was killed by Krishna and a new enmity started.

Krishna's cousin, Yudhisthira,