The primary source which confirms her parentage and marriage has not yet been identified. Heiress of Zutphen, and the Vogteien of Münster and Borghorst. "Comiti Godescalco et uxori suæ Adelhaidæ et eorum filiis Gebehardo et Ottoni" reached agreement with Wilhelm Bishop of Utrecht concerning certain payments, by charter dated 1059. 1
Marriage Information:
Adelheid married Gottschalk IN GAU NIFTERLAKE, Graaf van Zütphen, son of Gf. Herman IN GAU NIFTERLAKE. (Gottschalk IN GAU NIFTERLAKE died in 1063/4.)
Sources
1 Foundation for Medieval Genealogy: Medlands: Adelheid.