Mechtild zu Styrum Peerage person ID=86 (d. 1223) Parents Ada of Huntingdon Floris III Children Engelbert I. von Isenberg Bruno of Isenberg Adolf von Altena, Herr von Holte Theodoric III Agnes von Berg-Altena Eberhard II Graf von Altena und Isenburg Frederick of Isenberg Siblings Margareta van Hollant Florence of Holland Dirk VII, Count of Holland Boudewijn Ada of Holland William I, Count of Holland Agnes van Hollant Partners Arnold of Altena