Arnoul

https://fmg.ac/Projects/MedLands/NORMANDY%20NOBILITY.htm#GuillaumeB...

4. GUILLAUME [II] "Talvas" de Bellême (-after [1050/54]). m firstly HILDEBURGE, daughter of ARNOUL & his wife --. Guillaume of Jumièges records that “Willelmus cognomento Talavatius” married “Hildeburge...filiam Arnulfi” by whom he had “Arnulfum et Mabiliam” and whom he had strangled “a duobus parasitis”[58].

Research Notes

https://www.wikitree.com/wiki/Unknown-623213

Who is her father Arnulf?

In some unsourced online genealogies, (Arnulf (or Arnoul) the father of Hildeburg, has been equated with Arnulf, Count of Holland. However as he died in 993, it seems chronologically difficult for him to have been the father of Hildeburg, apart from the fact that the father, Arnulf is definitely named as a nobleman, not as a Count.

For similar reasons he couldn't be Arnulf II, Count of Flanders who died in 987 or 988.

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References

1. https://genealogics.org/getperson.php?personID=I00177417&tree=LEO cites
   1. [S00301] Schwennicke, Detlev (Ed.), ~Europäische Stammtafeln, J.A. Stargardt Verlag, Marburg. 3:636