General Notes
A number of people have Frederuna as the same person as Frederunda von Ringleheim, wife of Wichmann Billung (aka. Wickmann Count of Engern). I think that Frederunda was born about 20 years later than Frederuna. Frederunda von Ringleheim's mother, Ragnhilde, was the daughter of an 882 marriage, which makes her birth date much too late to be the wife of Charles III and mother of Ermentrude.
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