Fragment of a manuscript of Ptolemy's Geographia. The name Kalisia appears on the fourth line from the bottom . KALISIA A Trade Center on By KRZYSZTOF F Mor several centuries around the beginning of the Christian era, one of the principal trade arteries crossing Polish lands was the Amber Road. It linked the Baltic shore where amber abounded with the Roman Empire. Trade routes led from Aquileia which was an important commercial center as well as the leading center of amber working, to Lauriacum (Lorch in Austria) , the Amber Road DABROWSKI Vindobona (Vienna), Carnuntum (Komárno in Czechoslovakia) and Brigetio (Szöny in Hungary). At the bank of the Danube, the Roman hard surfaced highways ended, continued only by earth roads formed by local traffic. Most of these roads went by way of the Klodzko Basin and the Moravian Gate, extending through the Opole and Wroclaw region toward Kalisz. 157