Chiesa dell'Addolorata (ex Basilica di San Pietro)

On Piazza Addolorata, a short step from Acqui Terme's commercial streets, stands one of the earliest Christian sites in the city: a Romanesque church of three naves raised on the site of an early medieval basilica and monastery, its octagonal bell tower marking the skyline where Acqui's faith was organised a thousand years ago.

Why it matters

The church now dedicated to Our Lady of Sorrows is, in origin, the basilica of San Pietro — the abbey church of the monastery that anchored monastic life in Acqui from the eleventh century, built over an early Christian cemetery area. That continuity of ground is what makes the building exceptional: beneath and within the Romanesque structure survive elements of the earlier basilica, including parts of the apse and the base of the bell tower dated to the early Middle Ages. While the cathedral across town displays the wealth of the bishopric, San Pietro tells the parallel story of the monastery, the commenda system that later drained it, and the popular devotion that eventually gave the church its present name. It is a quiet monument, easy to underestimate, and central to understanding Acqui's religious topography.

What to notice

The body of the church is Romanesque at a glance: three naves separated by piers, brick and stone surfaces, the restrained proportions of eleventh-century building. On the south side, the apse carries the distinctive octagonal bell tower that rises directly above it — an unusual coupling that gives the exterior its silhouette. The apse and the base of the campanile belong to the earlier medieval basilica and predate the current church. The interior layout preserves a scar of later history — in 1720 the central nave was physically divided, and one portion was rearranged as the church of the Addolorata, the reason the building today carries two identities in one shell. After decades of decline, extensive restorations following the First World War reconstructed much of the church's Romanesque character.

Context and history

The monastery of San Pietro was founded in the eleventh century on ground already used by Acqui's earliest Christian community, and its basilica served as one of the city's principal churches throughout the Middle Ages. From the late fifteenth century the monastery fell into commenda — a system in which commendatory abbots drew the revenues without resident monastic life — and the complex entered a long decline. The decisive change came in 1720, when the central nave was partitioned to create a separate church for the confraternity of the Addolorata, embedding popular Marian devotion into the ancient shell. By the twentieth century the building had seriously decayed. Restorations begun after the First World War rebuilt naves and surfaces to recover its Romanesque appearance: the apse and tower base preserve early medieval fabric, while much of the rest is a Romanesque revival with an eighteenth-century internal organisation. Basilica di San Pietro is an established name for the building, alongside its dedication to Our Lady of Sorrows.