Hildegarde, daughter of Charlemagne & Hildegard, she died young

Please see Charlemagne Project for Source Details

From the Foundation for Medieval Genealogy page on the Carolingians:

http://fmg.ac/Projects/MedLands/CAROLINGIANS.htm#_Toc240955192

9. HILDEGARD (Thionville [Mar/Apr] 783-[1/8] Jun 783, bur Metz, église abbatiale de Saint-Arnoul).

"Hildigard" is named daughter of King Charles in the Pauli Gesta, when recording her place of burial[140]. Paulus Diaconus wrote an epitaph to "Hildegardis filiæ [Karoli regis]" specifying that she lived 40 days[141].

From the English Wikipedia page on Charlemagne, her father:

http://en.wikipedia.org/wiki/Charlemagne

His second wife was Hildegard (757 or 758-783), married 771, died 783. By her he had nine children:

9. Hildegarde (782-783)

No specific footnote or source reference noted.

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From the German Wikipedia page on Karl der Grosse, her father:

http://de.wikipedia.org/wiki/Karl_der_Gro%C3%9Fe

Nachfahren aus seiner Ehe mit Hildegard:

9. Hildegard (* 782 nach 8. Juni, † zwischen 1. und 8. Juni 783)

In English:

Descendants, from his marriage to Hildegard:

9. Hildegard (782 after June 8, d. 783 between 1 and 8 June.

No specific footnote or source reference noted.

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Ben M. Angel notes: The Holy Roman Empire began on 2 September 962. Hildegarde was born in the 8th century. As such, she, as with any member of the Carolingian dynasty, was never a member of the ruling house of the Holy Roman Empire. Charlemagne was coroneted Emperor of the Romans, not Holy Roman Emperor, and his empire was a precursor to the HRE.

Please review:

http://en.wikipedia.org/wiki/Holy_Roman_Empire