The gilt-stucco and mosaics on the interior of the coffered dome were executed after Raphael's sketches by Luigi de Pace in 1516. The motif is God the Father as Creator of the Firmament, surrounded by allegorical images of the Sun and of the six known planets, as depicted by the busts of pagan gods, each led by an angel. Between the windows the frescoes (1550), representing scenes of Creation and Original Sin, are by Francesco Salviati, as well as the medallions of The Seasons.