John III, Duke of Saxe-Lauenburg German duke (1330–1356) Parents Sophie of Werle-Güstrow Albert IV, Duke of Saxe-Lauenburg Children Siblings Eric III, Duke of Saxe-Lauenburg Albert V, Duke of Saxe-Lauenburg Bogislaw VI, Duke of Pomerania Wartislaw VI, Duke of Pomerania Elisabeth of Pomerania