Albert III, Margrave of Brandenburg-Salzwedel Co-ruler of Brandenburg from the House of Ascania (1250–1300) Parents Beatrice of Bohemia Otto III, Margrave of Brandenburg Children Henning von Brandenburg Margaret of Brandenburg Beatrix of Brandenburg Otto von Brandenburg Siblings Matilda of Brandenburg John III, Margrave of Brandenburg-Salzwedel Kunigunde of Brandenburg, Duchess of Slavonia Otto VI, Margrave of Brandenburg-Salzwedel Otto V, Margrave of Brandenburg-Salzwedel Partners Matilda