In his other wife, Mahārāja Priyavrata begot three sons, named Uttama, Tāmasa and Raivata. All of them later took charge of manvantara millenniums.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अन्यस्यामपि जायायां त्रयः पुत्रा आसन्नुत्तमस्तामसो रैवत इति मन्वन्तराधिपतयः
anyasyāmapi jāyāyāṃ trayaḥ putrā āsannuttamastāmaso raivata iti manvantarādhipatayaḥ
SB 5.1.28