Agnes of Saxe-Lauenburg Parents Eric IV, Duke of Saxe-Lauenburg Sophia of Braunschweig-Lüneburg Children Siblings Sophie of Saxe-Lauenburg Eric V, Duke of Saxe-Lauenburg Bernard II, Duke of Saxe-Lauenburg Agnes of Saxe-Lauenburg Albrecht von Sachsen-Lauenburg John IV, Duke of Saxe-Lauenburg Catherine of Saxe-Lauenburg, Duchess of Mecklenburg Magnus of Saxony-Lauenburg Partners Albert II, Count of Holstein-Segeberg