When copying data from this family tree, please include a reference to the origin: Derk Sherren, "Sherren Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/sherren-family-tree/I210123778550.php : accessed May 3, 2025), "John iv "The Wise" (John iv "The Wise") de Bretagne (Duke of Brettany) (1389-1442)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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