In the left lunette, destroyed in 1746-1748, Masolino had painted the Calling of Peter and Andrew, or Vocation, known thanks to some indications by past witnesses such as Vasari, Bocchi and Baldinucci.
•
Roberto Longhi first identified an image of this lost fresco in a later drawing, which does not conform to the lunette's upper curvature, but appears today as a very probable hypothesis.
The apse lunette was decorated by Belisario Corenzio with a fresco of the Virgin & John the Baptist pleading with the Trinity to liberate Naples from the plague.
The entrance portal is in white marble, and is surmounted by a lunette with marble sculptures of the "Madonna with Child between the Saints Ambrose and John of Meda".