Helene von Brandenburg Peerage person ID=7433 (d. 1304) Parents John I, Margrave of Brandenburg Sophia of Denmark Children Sophie of Landsberg Frederick Tuta Gertrude von Meißen Siblings Otto IV, Margrave of Brandenburg-Stendal Albrecht von Brandenburg Conrad, Margrave of Brandenburg-Stendal Agnes of Brandenburg Hermann von Brandenburg Eric of Brandenburg Mechtild von Brandenburg Henry I, Margrave of Brandenburg-Stendal John II, Margrave of Brandenburg-Stendal Partners Theodoric of Landsberg