|Canto 8: Withdrawal of the Cosmic Creations||Chapter 1: The Manus, Administrators of the Universe|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 8.1.27
manur nāmnā ca tāmasaḥ
pṛthuḥ khyātir naraḥ ketur
ity ādyā daśa tat-sutāḥ
caturtha — the fourth Manu; uttama-bhrātā — the brother of Uttama; manuḥ — became the Manu; nāmnā — celebrated by the name; ca — also; tāmasaḥ — Tāmasa; pṛthuḥ — Pṛthu; khyātiḥ — Khyāti; naraḥ — Nara; ketuḥ — Ketu; iti — thus; ādyāḥ — headed by; daśa — ten; tat-sutāḥ — sons of Tāmasa Manu.
The brother of the third Manu, Uttama, was celebrated by the name Tāmasa, and he became the fourth Manu. Tāmasa had ten sons, headed by Pṛthu, Khyāti, Nara and Ketu.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness