The Annalista Saxo names (in order) "Bennonis ducis, qui et Bernhardus et Liudigeri comitis et Machtildis comitisse" as brothers and sister of "domna Suanehildis [filia] Herimanni ducis de Liuniburh".
He succeeded as BERNHARD I Herzog in Sachsen. Adam of Bremen names "dux Benno et Sigafridus marchio" when recording their victory against the Vikings at Stade. The passage is undated but adjacent paragraphs suggest that it relates to an incident in the late 908s/early 990s.
The necrology of Lüneburg records the death "9 Feb" of "Bernhardus dux". The Vita Meinwerci records the death "Id Feb" of "Bernhardus dux Saxonicus, filius Herimanni ducis". 1
Research Notes: