Wikipedia https://en.wikipedia.org/wiki/Roger_fitz_Richard. Citing: Dugdale, Wil...

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Wikipedia https://en.wikipedia.org/wiki/Roger_fitz_Richard. Citing: Dugdale, William. The Baronage of England, Volume 1. G. Olms, 1675. ISBN 9783487063751 & "The History of Warkworth Castle" Amble andDistrict Local History (https://www.fusilier.co.uk/warkworth_castle/northumberland_1.htm)

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