The 13th-century Basilica of St. Nicholas is part of the Augustinian Monastery in the city of Tolentino. The church was a cathedral until 1586. Initially placed under the invocation of St. Augustine, the basilica was definitively dedicated to St. Nicholas after the accumulation of donations due to the popular fervour for the city's saint.
The Cathedral of San Severino was probably founded in the 13th century for the Augustinians. It preserves the 15th-century facade, a Gothic portal decorated with terracotta remains of frescoes attributed to Lorenzo d'Alessandro. The vast interior was reduced to its present state in 1776 and 1827 when the Augustinian church was transformed into a cathedral.
The present Treia Cathedral building was constructed between 1782 and 1814 according to the plans of the architect Andrea Vici. It has a Greek cross plan with three naves, divided by Corinthian columns and pillars. It has a large crypt. The church was damaged after the earthquake that hit central Italy in 2016.