Concattedrale di Santa Maria Assunta (Duomo di Bobbio)

Bobbio's cathedral has anchored Piazza Duomo since the eleventh century, when Bishop Guarnerio raised the church that carried the diocese's seat. A Romanesque body of three naves set between twin facade towers, it preserves an eighteenth-century presbytery cycle, late medieval frescoes and a crypt holding the bishops of the old diocese.

Why it matters

When Bobbio was raised to a diocese in the eleventh century, the new cathedral became the town's second pole of authority beside the abbey. The diocesan heritage portal records that Bishop Guarnerio had the church built around 1073, and it served as the seat of the bishops of Bobbio until the diocese was united with Piacenza in 1989, after which it became a co-cathedral. That long institutional history is written into the building: a structurally Romanesque core that stayed intact until the thirteenth century, a facade rebuilt in the fifteenth, and interiors re-decorated at intervals across seven centuries.

The cathedral also serves as a memorial to the former diocese. Its crypt gathers the remains of bishops from the seventeenth century onward, and the adjoining eleventh-century bishop's palace houses the diocesan museum.

What to notice

• The facade sits between two similar-height towers, a Romanesque feature of the church. The left tower served as the campanile and is topped by a triple-light window; the right tower was used as a fortress and received its bell cell and clock in 1532.
• Inside, the Latin-cross plan divides into three naves with groin-vaulted perimeter chapels; the naves and transept still show open wooden roof trusses, a survival of the medieval covering.
• The presbytery and transept carry perspective quadrature with scenes of the Assumption of the Virgin painted by the Milanese quadratura painter Francesco Porro from 1723 — the building's principal baroque cycle.
• The naves were redecorated in the late nineteenth century with Byzantinising frescoes, work of 1896 attributed in part to the Piedmontese painter Luigi Morgari.
• In the chapel of San Giovanni, restorations in the 1980s uncovered an Annunciazione of the late fifteenth century attributed to Bartolomeo Bernardi, known as Bonone, with echoes of Bramante and Foppa.
• The crypt contains the remains of Bobbio's bishops from the seventeenth century onward and a chapel dedicated to Sant'Antonio Maria Gianelli, bishop from 1838 to 1846 and co-patron of the town with San Colombano.

Context and history

The church rose a few decades after Bobbio became a diocesan seat, on the initiative of Bishop Guarnerio, and the piazza level around it rose too: the ground in front was later raised by about a metre and a half, hiding the base of the facade towers. The fifteenth-century facade reconstruction gave the front its present face, completed within the original tower frame. Interior campaigns followed liturgical fashion — quadratura and figure cycles in the Settecento, Byzantinising wall decoration in the 1890s — while restorations at the end of the twentieth century peeled back later layers enough to reveal the Bonone Annunciation.

The 1989 union of the diocese of Bobbio with Piacenza turned the cathedral into a co-cathedral of the combined see, and the diocesan museum opened in 2014 on the noble floor of the bishop's palace to conserve its treasury. The complex also includes gardens, an oratory and the former seminary that now houses the town's historical archives.