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Cawley, C. (9 May 2022). Scotland, Earls Created 1162-1398 (William IV Sutherlan...
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Cawley, C. (9 May 2022). Scotland, Earls Created 1162-1398 (William IV Sutherland, no. 1). Retrieved from Foundation for Medieval Genealogy (Available online); accessed 12 July 2022.