John V, Duke of Saxe-Lauenburg German duke (1439–1507) Parents Adelheid of Pomerania Bernard II, Duke of Saxe-Lauenburg Children Elisabeth von Sachsen-Lauenburg Magnus I, Duke of Saxe-Lauenburg Bernhard von Sachsen-Lauenburg Eric of Saxe-Lauenburg Sofie von Sachsen-Lauenburg John IV of Saxe-Lauenburg Siblings Sophie of Saxe-Lauenburg Partners Dorothea of Brandenburg, Duchess of Saxe-Lauenburg