Magnus I, Duke of Saxe-Lauenburg German noble (1488–1543) Parents Dorothea of Brandenburg, Duchess of Saxe-Lauenburg John V, Duke of Saxe-Lauenburg Children Catherine of Saxe-Lauenburg Sophie of Saxe-Lauenburg Clara of Saxe-Lauenburg Francis I, Duke of Saxe-Lauenburg Dorothea of Saxe-Lauenburg Ursula von Sachsen-Lauenburg Siblings Elisabeth von Sachsen-Lauenburg John IV of Saxe-Lauenburg Bernhard von Sachsen-Lauenburg Eric of Saxe-Lauenburg Sofie von Sachsen-Lauenburg Partners Catherine of Brunswick-Wolfenbüttel, Duchess of Saxe-Lauenburg
