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/P1868.php : accessed August 8, 2025), "William 1st Earl of Salisbury Montagu (1303-????)".
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