The son born to Kusha and Vaidarbhi. His brothers were Kushamba, Asurtarajas and Vasu. Kushanabha built Mahodayapura and ruled from there. he married Ghritachi and they had a hundred daughters. Vayu once asked them to be his wives. They laughed at him and he made them hunchbacked. The king was dejected at this.

During that time a sage named Chooli was meditating nearby. Somada, daughter of the gandharvi Urmila, used to serve him and Chooli granted her a child with his spiritual energy. He was named Brahmadatta. He married all the 100 maidens and they transformed to their earlier selves as soon as he touched them. Kushanabha then conducted a putrakameshti yajna for a son. Brahma appeared, and thus Gadhi was born to him. Gadhi later became the father of one son and one daughter. The son was Vishwamitra and the daughter Satyavati. Satyavati later married Richika and Vishwamitra began ruling Kanyakubja as per Ramayana Balakanda Sargas 32-35.