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This article says "The first known member of the house was Count Wichmann, mentioned as a Billung in 811."
The link for Count Wichmann leads to the article for "Wichmann the Elder" which gives the date of death of "23 April 944".
Either one of these articles is wrong or this person reached an age of about 150 years. 2A02:8388:8CC4:3A00:6116:DE0B:B96E:5A01 (talk) 21:01, 26 October 2021 (UTC)[reply]