The document discusses ancient civilizations in the Vrhnika region of Slovenia. It describes how the Celts inhabited the area in the 2nd half of the 1st century AD, and it became part of the Roman Empire between the 1st-6th centuries AD. Archaeologists uncovered artifacts showing Nauportus, an important Roman settlement and port, existed near an important trade route from the Adriatic Sea inland. Nauportus had buildings, warehouses, and a forum and served as a key trading and defensive point in the region for the Romans. After the fall of the Roman Empire, Slavs inhabited the area and Vrhnika again became important for trade from the 11th century along the main road