kaMsa/ ¦ (as), m. N. of a king of Mathurā (son of Ugra-sena and cousin of the Devakī who was mother of Kṛṣṇa [Ugra-sena being brother of Devaka, who was father of Devakī]; he is usually called the uncle, but was really a cousin of Kṛṣṇa, and became his implacable enemy because it had been prophesied to Kaṃsa that he would be killed by a child of Devakī; as the foe of the deity he is identified with the Asura Kālanemi; and, as he was ultimately slain by Kṛṣṇa, the latter receives epithets like kaMsa-jit, conqueror of Kaṃsa, &c.), MBh.; VP.; BhP. &c.
Sanskrit Dictionary