Gertrud von Egisheim (c995-1077)

Genealogie Mittelalter argues that she may be a daughter of Hugo IV. von Egisheim (970-1047), Aarnout van Holland (951-993), Ekbert Billung (935-994) or his son Ekbert II. Foundation of Medieval Genealogy, however, cites a source in which she is referred to as the sister of Pope