Allegretto di Nuzio was from Fabriano.  He is documented in Florence in 1346, and this document suggests that he had previously worked in Siena.  He seems to have returned to the Marches in ca. 1348, perhaps because of the Black Death, and to have spent the rest of his career there.

Perugia

Frescoes of the Evangelists (14th century)

Dormition of the Virgin (14th century)

This important fresco, which was recently rediscovered in the Cappella dei Consoli of  Sant’ Agostino (the chapel behind the right door in the back wall of the left transept) has been attributed to Allegretto Nuzi.  [Unfortunately, this chapel is usually locked.]