According to tradition, a monastery founded by San Mauro of Syria, father of San Felice, already existed since the early Middle Ages. Later, it became a religious centre of considerable importance. The current Church was built in 1190.

The Abbey of Saints Felice and Mauro, in the hamlet of Castel San Felice, was a complete reconstruction of a pre-existing religious building constructed by the Benedictines after the surrounding swamps had been reclaimed and is connected with the legend of San Felice, who is magnificently represented in the bas relief on the front of the church below the rose window.

The façade, one of the best examples of Romanesque architecture of Spoleto in its second phase, is embellished by Roman cosmatesque mosaics and features a triple, vertical and horizontal partition. Among the most interesting examples of Umbrian Romanesque sculpture are the double corolla rose window with the evangelical symbols bordered by cornices sculpted with geometric motifs, once decorated with polychrome tessera, the underlying reliefs which depict the stories of San Felice (from the right: he resurrects the widow’s son, the Angel guides the Saints, replika óra San Felice kills the dragon) and the Agnus Dei in the mediaeval tympanum. According to oral tradition, the Lamb is looking in the direction of buried treasure. At the side of the rose window are two, small, double-mullioned windows with small spiral columns.

The interior features a single nave with raised presbytery bordered by cosmatesque balustrades and a crypt with two apses, containing the sarcophagus which is traditionally attributed to the patron saint. Among the frescoes worthy of note are: The Adoration of the three Wise Men, by a delightful late-Gothic painter of the first half of the 15th century and, in the apse, The Christ giving his blessing and Angels by the Master of Eggi, which can be dated to between 1440 and 1450. The sarcophagus, made from rose-coloured stone, containing the remains of Felice, Mauro and the Syriac wet-nurse, is in the centre.