Maria of La Mark-Arenberg Countess of Helfenstein-Wiesensteig (d. 1563) Parents Walburge van Egmont Robert II of the Marck, lord of Arenberg Children Barbara of Helfenstein-Wiesensteig Rudolf II, Count of Helfenstein Catherine of Helfenstein-Wiesensteig Maria Magdalena of Helfenstein-Wiesensteig Siblings Margaretha von der Mark Robert III of the Marck Mahaut de La Marck Partners Sebastian, Count of Helfenstein