 A late 16th-century fresco of the "Matryrdom of St. Lawrence" serves as the reredos of the high altar and was painted by Pasquale Cati, a pupil of Michelangelo.The crucifix of the high altar is from the 14th century.The south side includes a painting of "St. Clare of Assisi" by Antonio Nessi (1756); a ceiling fresco of the "Glory of St. Lawrence" by Antonio Bicchierai; the tomb of the brothers St. Crispin and St. Crispinianus, with a painting by Giovanni Francesco Romano; and a painting of the Immaculate Conception by Giuseppe Ranucci.