Check the information Open Archives has about Markus.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Markus.
The Spier wereldwijd onderzoek publication was prepared by Jan Nienhuis (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Jan Nienhuis, "Spier wereldwijd onderzoek", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-spier/I375.php : accessed January 27, 2026), "Elsken Markus (1775-1848)".
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