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Baldwin, Stewart, 'Hermann 'Billung' in The Henry Project: The Ancestors of King...
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Baldwin, Stewart, 'Hermann 'Billung' in The Henry Project: The Ancestors of King Henry II of England, 3 April 2011. Database. American Society of Genealogists. https://fasg.org/projects/henryproject/data/herma000.htm : accessed 20 May 2021.