Overview
Wulfhilde Billung of Saxony (1072 – 29 December 1126) was the eldest daughter of Magnus, Duke of Saxony and his wife, Sophia of Hungary.
In about 1095 she married Duke Henry IX of Bavaria. As a result of this marriage, part of the Billung possessions came into the hands of the House of Guelph. They had the following children:
Henry X
Conrad (died: 17 March 1126 in Bari, buried in Molfetta), a Cistercian monk and saint
Sophia
Judith
Matilda (d. 1138), married Margrave Diephold IV of Vohburg (d. 1130) and Count Gebhard III of Sulzbach (d. 1188)
Welf VI
Wulfhilde, married Rudolf I, Count of Bregenz (d. 1160)
Wulfhilde died in 1126 and was buried at Weingarten Abbey.
References
From Wikipedia (CC BY-SA 4.0).