Cawley, C. (21 September 2020). Scotland, mormaers, earls, lords (Ch. 5 Earls of...

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Cawley, C. (21 September 2020). Scotland, mormaers, earls, lords (Ch. 5 Earls of Mar, Gilbert of Strathearn, 4 Robert, sec. e). Retrieved from Foundation for Medieval Genealogy (Available online); accessed 30 December 2020.

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