Portrait of john frederick i of saxony (1503-1554), duke and elector of saxony. The duke appears as a prisoner, armed and bleeding from a wound he received in the cheek at the battle of mühlberg, where he was defeated by the troops of emperor charles i of spain. Object Type: painting. Genre: portrait. Date: 1548. Dimensions: height: 129 cm (50.7 in); width: 93 cm (36.6 in). Medium: oil on canvas. Depicted People: John Frederick I. Collection: Museo del Prado. Johann Friedrich (Sachsen)