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 interior contains frescoes by Francesco d'Arezzo (1435).
Agostino also contains some good frescoes by Ottaviano Nelli of Gubbio.
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.