The abbey of San Vincenzo al Furlo or "di Petra Pertusa" (ad Petram Pertusa), is a Benedictine abbey not far from the Gola del Furlo, in Pianacce (in the municipality of Acqualagna), in the province of Pesaro and Urbino, in the Marche. The existence of the abbey is attested by the sources at the end of the 10th century.
The monastery was built on the left bank of the Candigliano river, along the Via Flaminia, near the Furlo gorge, where the city of Pitinum Mergens stood, a Roman municipality, abandoned in late ancient times [1].
Its prosperity was linked to the pious offers of travelers who crossed the Furlo gorge. It housed the relics of the bishop of Bevagna San Vincenzo, martyr in 303, after Bevagna had been destroyed by the Lombards in the sixth century. The first mention of the abbey dates back to a document of 970, which recalls the sale of the relics of St. Vincent to Deodoric, bishop of Metz.
The monastery hosted St. Romuald of Camaldoli in 1011 and St. Pier Damiani in 1042-1043, who was appointed abbot there and wrote the Vita beati Romualdi.
In 1246 it was damaged by a fire during a territorial dispute with Cagli, but it was rebuilt in 1271, as evidenced by the inscription on the architrave of the entrance portal to the church. The abbey was involved in the Western schism (1378-1417), when its abbot, Nicolò de Baratoli da Spoleto, was forced to abandon the monastery by the bishop of Urbino. In 1439 Pope Eugene IV decided to incorporate it into the chapter table of the diocese of Urbino. In 1589 the convent, abandoned by the monks, became the chaplain's residence.