When copying data from this family tree, please include a reference to the origin: Ger de Vries, "Family tree I.D.M. de Vries", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-i-m-d-de-vries/I3678.php : accessed June 12, 2024), "Heinrich I van Blahen en Harbeck (Graaf van Blahen en Harbeck) (± 1167-????)".
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