Jarasandha

Yudhistira wanted know about Jarasandha. Krishna then started telling him.

There was a king called Vrihadratha, in the land of Magadha. He was a fierce warrior. He was also a good and kind king. He married the twin daughters of the king of Kashi. . He loved his wives equally did not many difference between any of them. The king was growing old and he had no child. He wanted a son who would carry his name forward. One he heard that the sage  Chanda was staying near his kingdom and had taken shelter under a mango tree. The king visited the sage with his wives and started serving him. Pleased the sage asked the king to ask for a boon. The king told the sage that he wished to have a son.
Hearing this the sage handed over to the king, a ripe mango that fell on to the sage's lap from the tree. Happy, the king took the fruit and went home. The sage had told the king, to give the mango to one of his queens who would give birth to a son.

He took the fruit to his queens, who divided the fruit equally among themselves and each had half a fruit. In due time, both the queens conceived and the king was very happy.

When time came, the queens gave birth and it was shocking to see that each queen had given birth to half a child. Consulting among themselves, they abandoned the fragments behind the palace.

A rakshasha woman by the name of Jara was passing by. Seeing the parts of the child, she joined them together so she could easily carry it away with her. As soon as she joined the parts, the child came to life and started roaring. Assuming a human form, she went to the king and said this is your son, born from your wives and protected by me, Jara.