Serbinum

Serbinum, also known as Serbitium or Serbicium, was an ancient Roman city in the province of Pannonia. It was situated in what is now Gradiška in northern Bosnia and Herzegovina.

History
In Roman times, the Municipium Servicium was an important crossroad between the east and the south of the Balkans, i.e. a port for the Roman river fleet, which speaks for itself about the strategic importance of the settlement at the time.

The city could possibly be named after Serboi, ancient Sarmatian tribe, which perhaps inhabited the Pannonian Plain together with Iazyges.