Londonopia

London’s Lost Roman Basilica: The Forgotten Heart of Ancient Londinium

Beneath the bustling streets of modern London lie remnants of a bygone era, whispering tales of a city that once stood as a beacon of Roman civilization. Among these ancient echoes, the Roman basilica of Londinium emerges as a monumental testament to the city’s historical significance. Originally constructed around 70 AD and expanded between 90 and 120 AD, this architectural marvel not only dominated the landscape of Roman Britain but also played a pivotal role in the administrative and social life of its inhabitants.

The Genesis of Londinium’s Basilica

Following the Roman conquest of Britain in AD 43, Londinium was established as a strategic commercial hub along the River Thames. As the settlement flourished, the need for a central civic building became evident. Thus, around 70 AD, the Romans erected the basilica—a multifunctional edifice that served as the heart of public life. This initial structure provided a venue for administrative activities, legal proceedings, and commercial transactions, embodying the Roman commitment to organized urban planning and governance.​

Architectural Grandeur

The basilica’s architectural prowess was unparalleled in Britain. Spanning nearly 2 hectares and soaring up to three stories, it surpassed even the grandeur of present-day St. Paul’s Cathedral. Its design featured a vast central hall flanked by aisles, accommodating various public functions. The sheer scale of the basilica underscored Londinium’s prominence within the Roman Empire, marking it as the largest building of its kind north of the Alps.

The Forum: A Hub of Activity

Adjacent to the basilica lay the forum, an open-air marketplace and gathering space that complemented the basilica’s functions. Together, they formed the nucleus of Roman London’s civic life. The forum bustled with merchants, politicians, and citizens engaging in trade, discourse, and communal activities. This dynamic duo of basilica and forum mirrored the quintessential Roman template for urban centers, fostering a sense of community and order.​

Recent Discoveries

In a remarkable archaeological revelation, remnants of London’s first Roman basilica were unearthed beneath the basement of an office building at 85 Gracechurch Street. This discovery, made by archaeologists from the Museum of London Archaeology (MOLA), unveiled well-preserved sections of the basilica’s foundations, offering invaluable insights into the city’s ancient topography. The excavation revealed flint walls and Roman tiles, shedding light on the construction techniques employed by Roman builders. ​

The Basilica’s Multifaceted Role

The basilica was not merely an architectural marvel; it was the epicenter of Londinium’s administrative, judicial, and commercial activities. City administrators conducted official business within its walls, law courts deliberated on matters of justice, and assemblies convened to discuss civic issues. The basilica also housed the treasury and featured shrines, reflecting its spiritual significance. Its multifunctional nature underscored the Roman approach to centralized urban planning, where a single structure could serve diverse communal needs.​

A Testament to Roman Ingenuity

The discovery of the basilica’s remains offers a profound glimpse into Roman engineering and architectural prowess. The use of durable materials such as flint and ragstone, coupled with the incorporation of Roman tiles, exemplifies the sophisticated construction methods of the era. The basilica’s design facilitated natural lighting and ventilation, enhancing the functionality of the expansive interior spaces. These features not only highlight Roman ingenuity but also their adaptability in integrating local materials and techniques.​

Part of the Roman discovery at 85 Gracechurch Street

Preservation and Public Engagement

The redevelopment plans for 85 Gracechurch Street include provisions to preserve and showcase the basilica’s remains.The developers aim to integrate a public exhibition and event space within the new structure, allowing visitors to engage directly with this fragment of London’s ancient heritage. This initiative reflects a growing commitment to honouring and integrating historical discoveries within the urban fabric of contemporary cities.


The Roman basilica of Londinium stands as a monumental chapter in London’s rich tapestry of history. Its grandeur and multifunctionality epitomize the essence of Roman urban life, while recent archaeological discoveries continue to unveil the depth of its significance. As modern London evolves, the preservation and celebration of such historical treasures ensure that the legacy of Londinium’s basilica endures, offering future generations a tangible connection to their city’s ancient past.​


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