From Wikipedia
In Hinduism, Arjuna is the hero of the epic Mahabharat. He is the son of the king Pandu and his wife Kunti, although he is also the son of the godIndra. Arjuna is the third eldest of the five Pandava brothers. In the epic (which spans the course of his entire life), Arjuna becomes the greatest warrior of all time, attaining knowledge of all the weapons in the world. He is also the close friend of Krishna, an incarnation of the god Vishnu. The Bhagavad Gita, one of the most important texts of modern Hinduism, describes a conversation between Krishna and Arjuna.