Constantine the Great defeats the tyrant Maxentius

This is Jan de Bisschop's most ambitious drawing. It is a masterly rendering of a large fresco in the Vatican by Giulio Romano, which he executed with the help of sketches by Raphael. De Bisschop's model was not the actual wall painting – he never went to Rome – but rather one of the large engravings after the painting that were circulating at the time.