John III, Margrave of Brandenburg-Salzwedel Co-ruler of Brandenburg (1244–1268) Parents Beatrice of Bohemia Otto III, Margrave of Brandenburg Children Siblings Matilda of Brandenburg Kunigunde of Brandenburg, Duchess of Slavonia Albert III, Margrave of Brandenburg-Salzwedel Otto VI, Margrave of Brandenburg-Salzwedel Otto V, Margrave of Brandenburg-Salzwedel
