When copying data from this family tree, please include a reference to the origin: Henri Frebault, "Noblesse Européenne - European Nobility", database, Genealogy Online (https://www.genealogieonline.nl/noblesse-europeenne/I16277.php : accessed May 28, 2024), "Guglielmo (Guglielmo IV) del Monferrato (????-1100)".
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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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