A modest church on the edge of the old town near the Porta Romana, easily missed. Worth the small detour for the apse and triumphal arch, covered in a remarkable Last Judgement fresco cycle by Ottaviano Nelli (early 1400s) — the local master who also painted the apse at San Francesco. The condition is good, the light is moody, and you usually have the church to yourself.
Sant'Agostino
Romanesque church with Ottaviano Nelli fresco cycle of the Last Judgement