Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Upakamsa
Upakamsa:Son of Mahākamsa,king of Asitañjana and brother of Kamsa.When Kamsa became king,Upakamsa was his viceroy.Upakamsa was killed by a disc thrown by Vāsudeva,son of Devagabbhā.J.iv.79-82.