A spectacular archaeological discovery, unearthed during renovation at a hotel in Barcelona’s Gothic Quarter, fundamentally alters our understanding of the city’s Roman origins. Workers uncovered a pristine 42-square-metre section of the original Roman forum pavement, a find that forces a 90-degree rotation of ancient Barcino’s historical maps.

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Archaeologists made the discovery three years ago while preparing to install a new lift at the Gran Hotel Barcino, located at the junction of Carrer Jaume I and Carrer Hèrcules. Following standard protocol for construction in such a historically sensitive part of the Ciutat Vella district, a team from the Barcelona City Council and the Generalitat de Catalunya supervised the site. What they found surpassed all expectations.

Beneath the hotel, they uncovered a vast expanse of the foundational paving of Colonia Iulia Augusta Faventia Paterna Barcino, the city established by Emperor Augustus between 15 and 10 BC. Its surface features enormous slabs of Montjuïc stone, some measuring up to 1.5 metres long, characteristic of monumental Roman public works. According to reports in La Vanguardia, it represents the most significant Roman discovery in the city for decades.

A 90-Degree Shift in History

This revolutionary find settles a centuries-old debate about ancient Barcino’s layout. The Roman forum formed the heart of any Roman city, a central plaza housing the basilica, the curia (local senate), markets, and temples. For nearly two centuries, historians believed Barcino’s forum was oriented north-to-south, aligned with the main thoroughfare known as the cardo maximus.

This discovery proves the opposite. The pavement’s layout conclusively demonstrates the forum ran east-to-west, parallel to the city’s other main axis, the decumanus maximus. Consequently, every historical recreation of Roman Barcelona, from textbooks to tourist guides, is incorrect. The entire forum’s representation must be rotated 90 degrees.

This revelation vindicates several historians who questioned the established consensus. As early as 1595, chronicler Jeroni Pujades suggested a different orientation, but his theory was dismissed. In 1954, respected historian Agustí Duran i Sanpere also proposed the east-west alignment based on disparate finds; yet, the orthodox view prevailed. More recently, in 2014, a study by professors Héctor Orengo and Ada Cortés presented detailed arguments for the revised layout at the Museu d’Història de Barcelona (MUHBA). However, only this tangible evidence could force a city-wide reappraisal.

More Than Just Paving Stones

The three-year excavation, which Gargallo Hotels commendably expanded from six to 60 square metres, revealed more than just the forum’s orientation. This excavation provides a layered snapshot of 2,000 years of history on a single spot.

Archaeologists recovered over 50 fragments of luxurious imported marble from Carrara, Anatolia, and Egypt, proving it was a sumptuously decorated public space. They also found Roman concrete foundations and a sophisticated water management system, including two deep wells connected by a siphon to prevent water stagnation. A diverse collection of ancient coins tells a story of the site’s long history, with pieces from the Carolingian era, Al-Andalus, and even a rare coin commemorating the founding of Constantinople in 330 AD.

As the Roman Empire waned, the monumental pavement was likely repurposed as an open-air market or stable. Buildings began to rise on the site in the 14th century. Over the centuries, it housed noble families before becoming a convent and, finally, a hotel.

A New Window into the Past

Unlike many archaeological finds that are documented and re-covered, this piece of Barcelona’s foundational history will remain accessible. Gargallo Hotels plans to integrate the discovery into the building, creating a museum-quality space. Here, guests and the public can view the Roman pavement through a protective glass floor. This approach to preserving heritage during urban renewal echoes other city projects, including the archaeological tours offered during the ongoing Las Ramblas renovation.

The discovery not only redraws Barcino’s map but also prompts a re-evaluation of other major Roman landmarks, such as the four surviving columns of the Temple of Augustus on Carrer Paradís. For centuries, Barcelona has lived atop its own history. Now, thanks to a new lift shaft, another layer of that history comes brilliantly to light.