Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol. I @ p. 56
The cited information was published by Genealogical Publishing Co., Inc., Baltimore, 1986 (Ref: p. 56) The author/originator was von Redlich, Marcellus Donald Alexander R..
References (2)
Parent Source:
Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol. I
Individual:
Princess of England Adela