Explanation:

 Matsya Kingdom (Sanskrit for "fish") was one of the solasa (sixteen) Mahajanapadas (great kingdoms). The kingdom was established by an Indo-Aryan tribe of Vedic India.

By the late Vedic period, they ruled a kingdom located south of the Kurus, and west of the Yamuna river which separated it from the kingdom of the Panchalas. It roughly corresponded to the former state of Jaipur in Rajasthan, and included the whole of Hindaun, Alwar with portions of Bharatpur. The capital of Matsya was at Viratanagari (present-day Bairat) which is said to have been named after its founder king, Virata.