Welf I, Count of Altdorf father of Judith of Bavaria (0778–0825) Parents Irmentruda Thiedrada von Nagolzgau Gelph Count of Altdorf and Argengau Rothard van de Argengau Welpo (or Isebrand) Count in Bavaria Children unknown daughter von Altdorf Judith of Bavaria Conrad I, Count of Auxerre Hemma Rudolph Partners Hedwig
