Eric IV, Duke of Saxe-Lauenburg German duke (1354–1411) Parents Agnes of Holstein Eric II, Duke of Saxe-Lauenburg Children Magnus of Saxony-Lauenburg John IV, Duke of Saxe-Lauenburg Eric V, Duke of Saxe-Lauenburg Sophie of Saxe-Lauenburg Agnes of Saxe-Lauenburg Agnes of Saxe-Lauenburg Bernard II, Duke of Saxe-Lauenburg Catherine of Saxe-Lauenburg, Duchess of Mecklenburg Albrecht von Sachsen-Lauenburg Siblings Jutta of Saxe-Lauenburg Agnes von Sachsen-Lauenburg Partners Sophia of Braunschweig-Lüneburg