Catherine de Glogów (1300-1323) (1300–1323) Parents Matilda of Brunswick-Lüneburg Henry III, Duke of Głogów Children Adolph IX, Count of Holstein-Kiel Agnes of Holstein Elizabeth von Schauenburg Mechtild von Schauenburg Siblings Bolesław of Oleśnica Henry IV the Faithful Konrad I of Oleśnica Przemko II of Głogów Agnes of Glogau John, Duke of Ścinawa Partners John V, Margrave of Brandenburg-Salzwedel John III, Count of Holstein-Plön