 Their father Conrad I of Dachau was a son of Arnold I. of Scheyern, who was the youngest son of Otto I, Count of Scheyern.Conrad inherited Dachau from his father and lands in Dalmatia which had formerly been the March of Carniola from his mother, Willibirg, who had inherited them from Adelaide, daughter of Poppo II of Carniola.Conrad married Adelaide, daughter of Henry, Duke of Lower Lorraine, sometime before 1140.