The frescoes are interesting works of the early 13th century.
The walls and ceiling of the fine Romanesque interior are covered with frescoes of 1570, subdued in colour and well suited to the character of the building; those of the octagonal cupola representing the Assumption of the Virgin are by Correggio, but much restored.
The beautiful frescoes with scenes from the life of the saint (a local saint who died at the age of fifteen) are the earliest work of Domenico Ghirlandaio, completed before 1475.
Agostino (1280-1298) contains a famous series of seventeen frescoes by Benozzo Gozzoli, with scenes from the life of St Augustine (1463-1467).
Another restoration was undertaken after 1860, when a series of historical frescoes was painted upon its walls.