When copying data from this family tree, please include a reference to the origin: John Layton, "Royal House of Layton of Stuart and Rohan", database, Genealogy Online (https://www.genealogieonline.nl/royal-house-of-layton-of-stuart-and-rohan/P16809.php : accessed May 29, 2024), "Catherine de Montagu (????-1415)".
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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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