Indra and Surya were ancient rivals, each claiming supremacy in the Vedic pantheon. In the epic Ramayana, this rivalry takes the form of a conflict between Vali, who is the son of Indra and Sugriva, who is the son of Surya. God in the form of Ram sides with Sugriva over Vali. In the Mahabharata, God changes allies and prefers the son of Indra, Arjuna, over the son of Surya, Karna. Thus the balance is achieved between the two gods over two lifetimes.
