marked the border of the empire, and the Romans built fortifications and settlements on the banks of the Danube, including Vindobona. History Early references Early references to Vindobona are made by the geographer Ptolemy in his Geographica and the historian Aurelius Victor, who recounts that emperor Marcus Aurelius died in Vindobona on the 17 March 180. Today, there's a Marc-Aurelstraße (English: Marcus Aurelius street) near the Hoher Markt in Vienna. From a military base to a town… (More on Vindobona)