When copying data from this family tree, please include a reference to the origin: Hans Bus, "Family tree Bus-vanden Elsen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-bus/I4362.php : accessed June 18, 2024), "Alfonso IX XI van León (1171-1230)".
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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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