Colonia Claudia Ara Agrippinensium Archaeological Site

Colonia Claudia Ara Agrippinensium was the Roman colony established at the site of modern Cologne in the mid-first century CE. It became the principal Roman city in the lower Rhine region and the administrative center of the province of Germania Inferior.

Visible remains and museum collections document the Roman city’s public buildings, baths and domestic life; highlights include mosaics, statues and inscriptions recovered from excavations. Several Roman features are accessible in the modern city center around Cologne Cathedral and the Old Town, where archaeological displays and preserved foundations interpret the Roman urban layout.

The settlement received colonia status under Emperor Claudius in about AD 50 and the name references the imperial family and the local Ara (altar). Over subsequent centuries the city developed as a Roman military, administrative and commercial hub and later continued as an important medieval and modern urban center under changing rulers.

The Roman colonia occupied the riverside site of present-day Cologne in North Rhine-Westphalia, Germany, on the Rhine River. Many of the Roman remains lie beneath or adjacent to the central city area around Cologne Cathedral.

• Foundation date: Founded as a Roman colonia around AD 50, the site is the origin of modern Cologne and its Roman name Colonia Claudia Ara Agrippinensium.
• Archaeology in the city: Many Roman-era finds are now displayed in museums in central Cologne, often uncovered during city excavations beneath the medieval and modern urban fabric.

What to See#

• Roman-Germanic Museum: Roman-Germanic Museum in Cologne, which houses mosaics, sculptures and inscriptions recovered from the Roman city and its baths.
• Praetorium and city wall remains: Ruins of the Roman Praetorium and fragments of the Roman city wall that are preserved near Cologne Cathedral and the Old Town.

Roman sites are concentrated in Cologne’s historic center, within walking distance of Köln Hauptbahnhof (Cologne Central Station). Public transit and regional trains serve the city efficiently.

• Visit the Archaeological Zone and Roman-Germanic Museum in Cologne to see the best-preserved artifacts from Roman Colonia Claudia Ara Agrippinensium.
• Walk the old Roman wall fragments around the city center; look for pavement markers that trace the ancient cardo and decumanus streets.
• Combine Roman sites with a modern stroll across the Hohenzollern Bridge to see the city's layered history from river level.