Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 12
Sanskrit:
प्राणस्योर्जस्वती भार्या सह आयु: पुरोजव: ।ध्रुवस्य भार्या धरणिरसूत विविधा: पुर: ॥ १२ ॥
ITRANS:
prāṇasyorjasvatī bhāryāsaha āyuḥ purojavaḥdhruvasya bhāryā dharaṇirasūta vividhāḥ puraḥ
Translation:
Ūrjasvatī, the wife of Prāṇa, gave birth to three sons, named Saha, Āyus and Purojava. The wife of Dhruva was known as Dharaṇi, and from her womb various cities took birth.