A remarkable chapter in the long history of Athens is emerging on Vasilissis Olgas Avenue, where archaeological excavations by the Ministry of Culture have revealed a monumental Roman building complex that is now being restored and prepared for presentation.

Discovered during the redevelopment of the avenue, the complex includes a semicircular courtyard, colonnades, organized rooms, and an extensive network of drainage channels. Archaeologists have identified successive building phases dating from the 3rd to the 5th century AD, revealing a site that was repeatedly adapted and rebuilt during the Roman period.

Among the most impressive surviving elements is part of a semicircular colonnade with a mosaic floor dating to the first half of the 5th century AD. But the excavation has also revealed a much earlier chapter in the area’s history: a ditch belonging to the Themistoclean Wall, cut directly into the natural bedrock. It is the oldest surviving feature uncovered at the site and confirms the line of the ancient city’s fortifications.

The location is particularly significant. North of the Olympieion – the colossal Temple of Olympian Zeus – and close to the Ilissos River, the area has seen continuous human activity from prehistoric times through the early Byzantine period. Originally lying outside the walls of Classical Athens, it developed as a place of worship and habitation, with important sanctuaries. During the Roman period, particularly under Emperor Hadrian in the 2nd century AD, it was incorporated into the expanding urban fabric and became one of the city’s more prosperous districts, with substantial public and private buildings.

The newly excavated complex itself underwent two major phases of construction. The first dates from the late 3rd to the early 4th century AD, while a second major rebuilding took place in the early 5th century. Smaller alterations and extensions point to its continued use during Late Antiquity.

The story continued into the Byzantine period, from the 6th century onwards, although the character of the site changed. More modest masonry, underground storage pits and large “pithoi,” or storage jars, indicate that the area was increasingly used for production and storage rather than the grander residential and architectural purposes of the Roman period.

Now, rather than remaining an archaeological discovery hidden beneath the modern city, the complex is undergoing a program of restoration and enhancement. The works include conservation of the walls, mosaic floor, and architectural elements, vegetation management, removal of incompatible later interventions, and restoration of historical levels. A comprehensive rainwater-management system will also help protect the remains.

Culture Minister Lina Mendoni described the project as “the next essential step” following the reopening of Vasilissis Olgas Avenue in late April. The archaeological remains, she said, provide “an exceptionally important testimony to the diachronic development of the area north of the Olympieion, from the Classical period through to Byzantine times.”

She also highlighted the importance of integrating the different remains into a coherent archaeological site, saying that particular care was being given to their “functional and aesthetic integration.”

For visitors to Athens, the result promises to be more than another archaeological excavation. The restoration will bring a lesser-known part of the city’s ancient topography into view, revealing how a single area changed over centuries as Athens expanded, flourished under Roman rule and eventually entered the Byzantine world.

“The protection and enhancement of monuments,” Mendoni said, “is not only our obligation to the past, but also a conscious investment in our collective memory, our cultural identity, and the quality of public space.”

With information in Greek from kathimerini.gr.