Francis I, Duke of Saxe-Lauenburg German duke (1510–1581) Parents Catherine of Brunswick-Wolfenbüttel, Duchess of Saxe-Lauenburg Magnus I, Duke of Saxe-Lauenburg Children Magnus II, Duke of Saxe-Lauenburg Friedrich von Sachsen-Lauenburg Sidonia Catharina van Saksen Maurice, Duke of Saxe-Lauenburg Dorothea van Saksen-Lauenburg Francis II, Duke of Saxe-Lauenburg Henry of Saxe-Lauenburg Ursula of Saxe-Lauenburg Siblings Ursula von Sachsen-Lauenburg Catherine of Saxe-Lauenburg Clara of Saxe-Lauenburg Sophie of Saxe-Lauenburg Dorothea of Saxe-Lauenburg Partners Sibylle of Saxony