Who married Rudolf I, Duke of Saxe-Wittenberg?

Rudolf I (c. 1284 – 12 March 1356), a member of the House of Ascania, was Duke of Saxe-Wittenberg from 1298 until his death. By the Golden Bull of 1356 he was acknowledged as Elector of Saxony.

Kunigunde of Poland (Kunegunda) (c. 1298 – 9 April 1331) was a daughter of Władysław I the Elbow-high and his wife Jadwiga of Greater Poland. Her siblings included, Casimir III of Poland and Elisabeth, Queen of Hungary. She was a member of the House of Piast.