When copying data from this family tree, please include a reference to the origin: Marcel van der Sluis, "Ancestors Van der Sluis en De Oude", database, Genealogy Online (https://www.genealogieonline.nl/kwartierstaat-van-der-sluis-en-de-oude/I9011.php : accessed May 21, 2024), "Maria van Bulgarije (????-1081)".
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Please stick to the following rules
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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