The Romans had believed that Dīs Pater must be appeased by offering him human heads, and Saturn could be appeased by offering him victims. Despite this, it became practice to appease Dīs Pater with masks with human faces fashioned onto them, and Saturn was appeased with lights of kindling; this is due to a change in the interpretation of phôta, which can mean either "lights" or "man". This change of practice led to the exchange of candles in the festival Saturnalia.[3]