The Chronico Eberspergensi Posteriore names "Adalperonem et Eberhardum et Willibirgam et alias tres filias" as the children of "Udalricus" & his wife, recording in a later passage that Williburg was "in eodem monasterio". Her marriage is deduced from the Chronico Eberspergense which names "Hadamuoden neptem suam [Oudalrici Eberspergensi] de filia Willibirga", specifying that her maternal grandfather granted her properties in "Sevun, Otacheresperc…Niuunchirchen …Huntilpach" as his sons had no surviving children. "Comitissa Willibirch" donated property to Geisenfeld monastery, at the request of "filie sue Liutkarde", in memory of "defunctique mariti Werigandi." "Domina Azcica" donated property to the monastery of San Michele di Leme, with the consent of "domine Wilpurge matris sue…et…domini Wolderici filii sui" by charter dated 12 May 1040.
The necrology of Ebersberg records the death "VII Kal Dec" of "Willipirc com filia O". 1
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