In 35 - 33 BC the Žumberak Mountains became part of the Roman Republic, later empire, province of Pannonia. The most important remains are several graveyards dating from 1st century AD found in the central Žumberak Mountains, in villages of Gornja Vas and Bratelji. People buried in those graveyards belonged to the Celtic tribe of Latobics. Many glass containers were found in these graves. These containers were produced in northern Italy, and they are proof that people in the Žumberak Mountains had a powerful economy at that time.