While Śukadeva Gosvāmī was narrating various activities of Lord Kṛṣṇa in playing the role of an ordinary human being, he also narrated the history of the battle between the dynasty of Yadu and a demon of the name Śālva, who had managed to possess a wonderful airship named Saubha. King Śālva was a great friend of Śiśupāla's. When Śiśupāla went to marry Rukmiṇī, Śālva was one of the members of the bridegroom's party. When there was a fight between the soldiers of the Yadu dynasty and the kings of the opposite side, Śālva was defeated by the soldiers of the Yadu dynasty. But, despite his defeat, he made a promise before all the kings that he would in the future rid the whole world of all the members of the Yadu dynasty. Since his defeat in the fight during the marriage of Rukmiṇī, he had maintained within himself an unforgettable envy of Lord Kṛṣṇa, and he was, in fact, a fool, because he had promised to kill Kṛṣṇa.