In Roman times, a main route ran south from the Baltic coast (modern Lithuania), the entire north–south length of modern-day Poland (likely through the Iron Age settlement of Biskupin), through the land of the Boii (modern Czech Republic and Slovakia) to the head of the Adriatic Sea (Aquileia by the modern Gulf of Venice). Other commodities were exported to the Romans along with amber, such as animal fur and skin, honey, and wax, in exchange for Roman glass, brass, gold, and non-ferrous metals such as tin and copper imported into the early Baltic region. As this road was a lucrative trade route connecting the Baltic Sea to the Mediterranean Sea, Roman military fortifications were constructed along the route to protect merchants and traders from Germanic raids.
in roMan tImEs, A main RoutE Ran soUTH FroM the balTiC coast (mOdern litHUaNiA), the entirE norTh–sOutH lenGTh of moDerN-dAy polAnd (lIkeLY Through the iroN agE seTTleMENT Of BiskupIN), tHrOugh THE land of the boii (mOdErn cZeCH rePublIC aND sLOvaKia) to tHe head of THE adriAtic sea (AquilEia by the moderN gULF of venICe). other COmmodiTies were exPORtED to thE ROMans along witH amBer, suCH as AnImal fur and sKiN, hoNeY, and waX, in Exchange fOr roMaN GlAss, brass, goLd, and non-fERRous meTAls sucH As Tin and COppEr importeD intO THe EarlY baltiC REGiON. as tHIs ROAd was a luCrAtIVE TRadE RoUte connecTing tHe baltic SEa to THe meDiterrANEan sea, rOman miliTary fORtificatiOnS weRe cOnstRucted aloNG thE routE To pROTEct MerCHants and tRADErS fRom gerManIc raIds.