 The intrados of the apse arch houses, within shielded frames, a series of portraits, only partially visible, but very expressive, in fifteenth-century dresses, probably prophets and sibyls; the basin shows pictorial fragments that can be interpreted as the symbols of the four Evangelists (Tetramorfo), in a rough rocky landscape, and in the center a lacunose Maiestas Domini.On the left a kneeling female figure, probably still a Virgin, and on the right a fragment of a figure.In the lower part, in the center, the wood of the cross with the canonical inscription, which could be the background of a Pietà.