Matsya was one of the sixteen Mahajanapadas mentioned in the Buddhist text Anguttara Nikaya. The founder of the kingdom of the Matsya was Virata. It consisted of the present-day Alwar, Jaipur and Bharatpur.
Viharas were for the purpose of living, Chaityas were assemblies for the purpose of discussions. Further, Chaityas were with Stupas, Viharas did not have stupas.
Fa Hien or Faxian who was a famous Chinese traveler, visited India during his reign of Chandragupta II. He came through land route and went back through sea route.