Introduction
Kamsa is the son of Ugrasena, who took the throne of Mathura from his father. He is the maternal uncle of Krishna, who kills him.
Family
The prophecy
Kamsa was told that Devaki's eighth son would kill him. He imprisoned Devaki and Vasudeva and killed their first six children. Krishna, the eighth, was smuggled out and raised at Gokula.
Death
Kamsa sent many demons to kill the boy. When Krishna and Balarama came to Mathura for a festival, Krishna killed Kamsa in the arena. He restored Ugrasena to the throne.
Jarasandha
Kamsa was married to Asti and Prapti, the daughters of Jarasandha of Magadha. After his death, Jarasandha repeatedly attacked Mathura, which led the Yadavas to move to Dwaraka.