In the Indian epic Mahabharata, Abhimanyu is the son of the Pandava Arjuna and Subhadra the sister of Lord Krishna. He is thus the nephew of the other four Pandava brothers. Since Karna is also a son of Kunti, he also was a nephew to Karna, one of his murderers. Though Abhimanyu and the other Pandavas were unaware of this fact, Karna was cognizant of the relationship, which is what makes the killing of Abhimanyu a particularly heinous crime.
He is husband to the Matsya kingdom's princess, Uttarā, who was pregnant with his child Parikshikt at the time of his death.
Abhimanyu is also said to be an incarnation of Varchas, the son of the Moon God.
The Mahabharata records that Karna was instrumental in the killing of Abhimanyu. Karna asks Drona how Abhimanyu can be killed to which Drona replies : "Abhimanyu is young, his prowess is great. His coat of mail is impenetrable. This one's father had been taught by me the method of wearing defensive armour. This subjugator of hostile towns assuredly knoweth the entire science (of wearing armour). With shafts well shot, you can, however, cut off his bow, bow-string, the reins of his steeds, the steeds themselves, and two Parshni charioteers. O mighty bowman, O son of Radha, if competent, do this. Making him turn back from the fight (by this means), strike him then. With his bow in hand he is incapable of being vanquished by the very gods and the Asuras together. If you wish, deprive him of his car, and divest him of his bow".
Abhimanyu was 16 years old at the time of his death. The name Abhimanyu is a Sanskrit word meaning "heroic".