Earl of Mar
Royal title
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There are currently two earldoms of Mar in the Peerage of Scotland, and the title has been created seven times. The first creation of the earldom is currently held by Margaret of Mar, 31st Countess of Mar, who is also clan chief of Clan Mar. Wikipedia
Past holders: James Douglas, 2nd Earl of Douglas, Alexander Stewart, Earl of Mar, and Domnall mac Eimín
Peerage: Peerage of Scotland
First holder: Ruadrí, Earl of Mar
Former seat(s): Mar's Wark, Kildrummy Castle and Doune of Invernochty