The son of Agni named Svārociṣa became the second Manu. His sons were headed by Dyumat, Suṣeṇa and Rociṣmat. Each Manvantara has six elements. It is said: manvantaraṁ manur devā manu-putrāḥ sureśvarāḥ rṣayo 'ṁśāvatārāś ca hareḥ ṣaḍ-vidham ucyate Manvantaram means the reign of Manu, during which six types of personalities carry out specific duties: the ruling Manu, the devatās, the sons of Manu, Indra, the great sages and the partial incarnations of the Supreme Lord. SB 12.7.15 In the first Manvantara, Svāyambhuva was Manu, his sons were Priyavrata and Uttānapāda, the devatās were Yāma and others, and the seven sages were Marīci and others. Yajṣa was the avatāra and he also became Indra. These have been described in the Fourth Canto. Twelve verses now describe these six elements for the second, third and fourth Manvantaras.