Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol. I @ p. 277
The cited information was published by Genealogical Publishing Co., Inc., Baltimore, 1986 (Ref: p. 277) The author/originator was von Redlich, Marcellus Donald Alexander R..
References (3)
Parent Source:
Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol. I
Individual:
Richildis, Countess of Hainault
Individual:
Henry II de Lorraine Count of Louvain & Lorraine