Vishnupurana 3.1.15

3.1.15

vasiṣṭhatanayā hyote sapta saptarṣayobhavan /
ajaḥ paraśudīptādyāstathottamamanoḥsutāḥ //

In the third period, or Manwantara of Auttami, Suśánti was the Indra, the king of the gods; the orders of whom were the Sudhámas, Satyas, Śivas, Pradarśanas, and Vasavertis; each of the five orders consisting of twelve divinities. The seven sons of Vaśisht́ha were the seven Rishis; and Aja, Paraśu, Divya, and others, were the sons of the Manu.