Śāṃśapāyana said:: O! how powerful and excessively efficient was Vāli the son of Mahendra. He had performed thousands of Yajñas. He was extremely unconquerable. Vāli has been described as a highly intelligent emperor by you. Recount to us how Mārtaṇḍa came to be known so. O holy lord of very sacred rites, explain its etymologial derivation factually.