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From http://fmg.ac/Projects/MedLands/SOUTHERN%20ITALY,%20PRE-NORMAN.htm#...
m ADELTRUDA, daughter of --- "Adelchis Langobardorum gentis princeps" donated property, at the request of "Adeltrud conjugis nostr ¦", by charter dated Feb 876[221]. She may have been the sister of Count Audoald, as suggested by the Chronican Vulturnense which records that "Adelchis Langobardorum gentis Princeps" confirmed the privileges of the abbot of Volturno, at the request of "Audoaldi comitis cognati nostri", by charter dated Feb [878][222]
Prince Adelchis & his wife had [ten] children: ...
https://www.geni.com/people/Adeltrude/6000000181702008829
Madre de Aiulf II, prince of Benevento; Radelchis II, prince of Benevento; Ageltruda di Benevento and ... di Capua