Cologne is the oldest major city in Germany. The name Cologne stems from the Roman empress Agrippina. The wife of the Emperor Claudius was born on the banks of the Rhine and elevated her "Colonia" to the status of a city in the year 50 A.D. Today, traces of the Romans are still to be found at every turn in Cologne: the Dionysus mosaic in the Römisch-Germanisches Museum, sections of the Roman city wall and the Roman water system, which formerly brought fresh spring water to the Roman city from the Eifel region.