• Married: Abt 1047
• Died: Between 1094 and 23 Jul 1095

  Research Notes:

"Hildegardis…cum filiis meis, Ottone…Argentinenis ecclesie episcopo Suevorumque duce Friderico, Lodewico, Walthario, Cunrado et filia mea Adalheida" made a donation to the monastery of St Fides at Schlettstadt in Alsace dated 1094, presumably just before she died. She may have been the heiress of the land on which her son later built the castle of Stauf. Jackman suggests that she was Hildegard, daughter of Graf Otto & his wife ---, emphasising that it could provide an explanation based on heredity for the appointment of Hildegard's son, Friedrich von Büren, as Duke of Swabia in 1079. This assumes the need for such a hereditary basis, whereas it appears that the duchy of Swabia was awarded on the basis of the political or economic power of the nominee. In addition, if heredity had been the basis for the nomination, there would clearly have been other candidates with a senior claim. Decker-Hauff suggested that Hildegard was the daughter of Louis de Mousson (who would have been Hildegard's sister if Jackman's theory is correct). Jackman says that this should be rejected on chronological grounds as Sophie de Lorraine, the wife of Louis de Mousson, must have been born in [1020] and could not therefore have been the grandmother of Friedrich I Duke of Swabia, born in [1050]. ¹