Vindobona was originally a Celtic settlement, and later a Roman military camp on the site of the modern city of Vienna in Austria. Around 15 B.C., the kingdom of Noricum was included in the Roman Empire. Henceforth, the Danube marked the border of the empire, and the Romans built fortifications and settlements on the banks of the Danube. Early references The geographer Ptolemy mentions Vindobona in his Geographica. The historian Aurelius Victor recounts that emperor Marcus Aurelius, whose hea… (More on Vindobona)