Mahabharata 1.5.7

1.5.7

bhṛgoḥ sudayitaḥ putraścyavano nāma bhārgavaḥ |
cyavanasyāpi dāyādaḥ pramatirnāma dhārmikaḥ |
pramaterapyabhūtputro ghṛtācyāṃ rururityuta || 7 ||

"The great and blessed saint Bhrigu, we are informed, was produced by the self-existing Brahma from the fire at the sacrifice of Varuna. And Bhrigu had a son, named Chyavana, whom he dearly loved. And to Chyavana was born a virtuous son called Pramati. And Pramati had a son named Ruru by Ghritachi (the celestial dancer). And to Ruru also by his wife Pramadvara, was born a son, whose name was Sunaka. He was, O Saunaka, thy great ancestor exceedingly virtuous in his ways. He was devoted to asceticism, of great reputation, proficient in law, and eminent among those having a knowledge of the Vedas. He was virtuous, truthful, and of well-regulated fare.'