Painter's identity not handed down; it depicts both apocalyptic and trinitarian ideas. In the crest the eye of God with the four cardinal virtues; above the choir gallery we find Fides, the incarnation of faith, below the Holy Spirit and surrounded by four latin church fathers (Ambrose of Milan, Augustine of Hippo, Jerome of Stridonium, Gregory the Great). In the centre you can see the adoration of the apocalyptic lamb by angels (inner circle), saints and justs (outer circle). Apostles in the eastern part are confronted with the just men of the Covenant in the western part of the cupola, while saints of religious orders (north) face holy martyrs (south). The four evangelists reside in the spandrels.