Mar

Mar, a district in S. Aberdeenshire, between the Don and the Dee, has given a title to many earls; one was regent of Scotland in 1572, another, nicknamed “Bobbing Joan,” led the Jacobite rising of 1715; on the death without issue of the earl in 1866 the question of succession was at issue; the Committee of Privileges granted it to his cousin, the Earl of Kellie, thereafter Mar and Kellie, and a Bill in Parliament awarding it to his nephew, who is thus Earl of Mar.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)