Catherine of Saxe-Lauenburg, Duchess of Mecklenburg German noblewoman (1400-1450) (1400–1450) Parents Sophia of Braunschweig-Lüneburg Eric IV, Duke of Saxe-Lauenburg Children Henry IV, Duke of Mecklenburg John V Siblings Magnus of Saxony-Lauenburg Eric V, Duke of Saxe-Lauenburg Bernard II, Duke of Saxe-Lauenburg John IV, Duke of Saxe-Lauenburg Agnes of Saxe-Lauenburg Sophie of Saxe-Lauenburg Agnes of Saxe-Lauenburg Albrecht von Sachsen-Lauenburg Partners John IV, Duke of Mecklenburg John VII of Werle