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I have also found this information.  A lot of family trees on Ancestry seem to have her as a daughter of Ernest the Pious but I can not see this being true given the pious lifestyle of Ernest  (and why would just one of his children have been born in UK)  I have a document confirming Marie's death in 1679 and references for the children of Marie and John. Can not find a document to confirm the marriage though nor the birth or baptism of Marie and therefore her maiden  name.