Wikipedia
Rishabhadatta (also Ushavadata) was viceroy of the Western Satrap ruler Nahapana, and his son-in-law.
Ancient inscriptions were incised in the Pandu-lena caves near Nasik describing how Rishabhadatta was son of Dinika and had married Dakshamitra, daughter of Nahapana. According to the inscriptions, Ushavadata accomplished various charities and conquests on behalf of his father-in-law. He constructed rest-houses, gardens and tanks at Bharukachchha ( Broach), Dashapura ( Mandasor in Malva), Govardhana (near Nasik) and Shorparaga ( Sopara in the Thana district). He also campaigned in the north under the orders of Nahapana to rescue the Uttamabhadras who had been attacked by the Malayas ( Malavas). He excavated a cave (one of Pandavleni Caves) in the Trirashmi hill near Nasik and offered it to the Buddhist monks. In his reign, he converted to Hinduism.
The Satavahana king Gautamiputra Satakarni appears to have defeated Rishabhadatta. An inscription discovered in Nashik, dated to the 18th year of Gautamiputra's reign, states that he donated a piece of land to Buddhist monks; this land was earlier in the possession of Ushavadata.