A son born to कुश of वैदर्भी . (For Genealogy see under Viśvāmitra) . Sage कुश had four sons, namely कुशाम्ब , कुशनाभ , असूर्तरजस and वसु , and कुशनाभ built महोदयपुर and lived there. One hundred daughters were born to him of his wife घृताची . वायुभगवान् once asked the girls to marry him at which proposal they laughed at him in derision. He cursed them and made them hunch-backed ugly women, and कुशनाभ felt very sorry about this cruel fate of his daughters.

To सोमदा , daughter of a Gandharva woman called ऊर्मिला , had been born a son, ब्रह्मदत्त , due to the mental power of the sage चूलि कुशनाभ gave in marriage his hundred daughters to ब्रह्मदत्त , and they were cured of their hunch at the touch of ब्रह्मदत्त and became their previous beautiful selves.

कुशनाभ conducted the yajña called पुत्रकामेष्टि , and कुश , who was so pleased by the yajña blessed him to have a son called गाधि . विश्वामित्र was the son of this गाधि . विश्वामित्र had also a sister सत्यवती , whom ऋचीक wedded. (Vālmīki Rāmāyaṇa, Bālakāṇḍa, Cantos 32-35).