Child(ren):
The Nibelungids were a Frankish noble family descended from Childebrand, the younger full brother of Charles Martel.
They formed a cadet branch, alongside the Carolingians, of the Arnulfing− Pippinid house. The dynasty got its name from Childebrand's heir, Nibelung I ("The Historian").
Childebrand's immediate descendants held the County of the Vexin in the 9th century. The relationships between the various Childebrands and Nibelungs of the period are rarely attested in primary sources, leaving it to genealogists, prosopographers, and onomasticists to piece together possible lines of descent. It has been suggested that they were related to the family of William of Gellone and to the Counts of Autun, from which may have descended Ringard, the wife of Pepin II of Aquitaine.
SOURCE: Wikipedia - https://en.wikipedia.org/wiki/Nibelungids
NIBELUNG [II], son of --- ([750/60]-[after 805]). Comte Nibelung donated property "Calliacum" in the county of Madrie to La Croix-Saint-Ouen for the souls of his unnamed parents and children by charter dated to [788]. Nibelung donated property to Saint-Denis by charter dated 805, although this could alternatively refer to Nibelung [III]. Settipani suggests that Nibelung [II] was the son of Nibelung [I]. However, children of Nibelung [I] would probably have been born in the range [730/45]. If this is correct, [788] seems late for the first mention of Nibelung [II] in historical records. m ---. The [788] document cited above refers to the children (unnamed) of Nibelung [II] so he was presumably married, although there is no indication of the name of his wife. Settipani highlights the onomastic connections with the family of St Guillaume suggested by the names Bernard and Theoderic borne by the possible descendants of Nibelung [II] shown below. He suggests that, if there was a connection between the two families, it may have been through the wife of Nibelung [II] who could have been either Abba or Berta, one of the sisters of (St) Guillaume Comte de Toulouse. The difficulty with this hypothesis is that the Vita S. Willelmi implies that Guillaume’s sisters remained unmarried when it records that he had “duæ sorores virgines…Albana…Bertana”. Nibelung [II] & his wife had --- children:
a) --- . The [788] document cited above refers to the children (unnamed) of Nibelung
http://fmg.ac/Projects/MedLands/FRANKISH%20NOBILITY.htm#_Toc143595867
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