Question: who is upamanyu in mahabharata?
Answer: Upamanyu is a rigvedic rishi. He was devotee of lord Shiva . Lord Shiva pleased with his tapasya gave him boon & blessings. He is said to be the father or ancestor of sage Kamboja Aupamanyava referred to in the Vamsa Brahmana (1.18) of the Sama Veda.