Erected in the first half of the 1300s in sober Cistercian forms, the Dominican church of St. Peter Martyr was attached to a convent, already founded in 1280, which later served as the seat of the court of the Inquisition. The three-aisled interior was restored during the 20th century to recover its original layout with alternating stone and terracotta cylindrical pillars. The restoration returned numerous fragments of 14th-century frescoes, referable to Lombard painters influenced by Giotto. The exterior, facing the square with the monument to the Monza painter Moses Bianchi, underwent a 19th-century restoration in neo-Romanesque style, while the ancient cloister visible from inside the church is perfectly preserved.
