This work of Costanzo Festa is the earliest collection of polyphonic hymns and Magnificats by a single composer in the Sistine fondo. The opening of his hymn "Conditor alme siderum" is shown here, with the arms of the reigning pope Paul III on the elaborately decorated "Q" in the upper left. The coat of arms at the bottom of the right-hand page--lions holding a wreath with a fleur-de- lis--may be the composer's personal coat of arms. (click on image to enlarge)