The researchers consider the settlement a possible match for Claudivium, a place named by the second-century geographer Ptolemy... Ptolemy recorded a place called Claudivium near the Danube.
The Romans inherited much of their astronomical knowledge from the Greeks, especially the works of figures like Ptolemy, Hipparchus, and Aristotle... He found no flaws in Hipparchus's theories and passed them on to Ptolemy.