Agnes of Holstein Duchess of Saxe-Lauenburg (1400–1386) Parents John III, Count of Holstein-Plön Catherine de Glogów Children Eric IV, Duke of Saxe-Lauenburg Jutta of Saxe-Lauenburg Siblings Adolph IX, Count of Holstein-Kiel Mechtild von Schauenburg Mirislava von Holstein-Plön Elizabeth von Schauenburg Partners Eric II, Duke of Saxe-Lauenburg