What Was the First Roman Basilica in London?

What Was the First Roman Basilica in London?

The first Roman basilica in London was the administrative and judicial heart of Londinium, built around 70 CE beneath what is now the City of London’s financial district — and its foundations were rediscovered by archaeologists digging beneath a modern office building.

The Civic Heart of Roman London

When the Romans established Londinium, they needed more than a settlement — they needed a city. The basilica was their answer: a combined town hall, law court, and civic center positioned at the top of a commanding hilltop site. Every major road in the city converged on this building. Every significant legal dispute was settled within its walls. In Roman urban planning, the basilica was the place where the empire’s authority was made physical, and London’s first version was no exception.

Why Did the Romans Tear It Down?

Around 100 CE, the Romans demolished the first basilica — not because it had failed, but because they had grander ambitions. A second, far larger basilica was constructed on the exact same hilltop site. This replacement was extraordinary in scale: when complete, it stretched longer than any other basilica north of the Alps, making it one of the most impressive civic buildings in the entire Roman world outside Italy.

The stones of the first basilica were not simply discarded. Archaeologists believe much of the original material was incorporated directly into the new construction — the old city literally absorbed into the bones of the new one. This kind of pragmatic recycling was common in Roman building practice.

The Forum and Basilica Complex

The basilica formed one side of a larger forum and basilica complex — the civic and commercial core of Londinium. Traces of this complex are still visible today. Visitors can see remains of the Roman forum and basilica in the basement beneath Leadenhall Market, just a short walk from the original site. The juxtaposition of ancient Roman stonework and one of London’s most famous Victorian market halls captures something remarkable about the city’s layered history.

The Deliberate Dismantling Around 300 CE

Around 300 CE, the great basilica complex was systematically taken apart. Londinium was in decline: its population was shrinking, trade at the port was fading, and ancient sources suggest the city may have been politically punished for backing the rebel emperor Carausius. Following his defeat, Londinium was reportedly demoted from its role as capital of the whole province to capital of just one smaller division of Roman Britain.

Workers dismantled the basilica piece by piece, carrying off stone and brick to be reused elsewhere across the city and beyond. Archaeologists call this process spoliation — the organised stripping of a city’s own monuments for building material. It was not an act of destruction in the chaotic sense; it was methodical, deliberate, and efficient. One of the mightiest civic buildings in all of Roman Britain simply ceased to exist, and the site was eventually buried under centuries of later construction.

Rediscovered Beneath an Office Block

Seventeen hundred years later, archaeologists digging test pits beneath an office basement in the City of London — ahead of a planned redevelopment — broke through the floor and uncovered massive walls belonging to the first basilica. The discovery brought the hidden heart of an ancient capital back into the light, sitting silently beneath one of the busiest financial districts on Earth.

The find is a reminder of how deep London’s history runs. Beneath the glass towers and trading floors, the foundations of a Roman city hall have been waiting for nearly two thousand years.