The work of Domenico Zampieri, also known as Domenichino (Little Dominic). The white and gold stucco bands with racemes, plant volutes, rosettes, ovals, dentils and putto’s (chubby, winged angel also known as a cherub) reliefs adorning the apse are work of Domenichino. He led this pictorial work between 1624 and 1628.
The rectangular fresco in the highest point of arch of the presbytery, represents the “Ecce Agnus Dei”, that is, s. John the Baptist who points to the future apostles Andrew and John the figure of Christ.
At the center, above the window, “The vocation of the brothers Peter and Andrew”.
In the right corner scene, “S. Andrew led to martyrdom. “,
In the left scene corner: “The flagellation of s. Andrew”.
Within a double frame, supported by six stucco figures resting on fake shelves and forming an elongated lunette, “The glorification of s. Andrew”.
Among the windows of the apse, Domenichino painted six figures of virtue: Faith, Charity, Religion, Hope, Fortress, and Prayer.
In the stump of the windows , from where the putto’s are stinging pears, alluding to the emblem of the Peretti family.