Mormaer of Mar.
aka Roderick of Mar, Raudri Mawr
Donald mac Emkin mac Cainnech, an early Mormaer of Mar, is said to have been one of the 10 Mormaers who crossed over to Ireland to assist Brien Boroihme against the Danes, by whom both were slain in the battle of Clontarf in 1014. The names of Donald's successors are unknown until the time of Roderick, about 100 years later, and Roderick accordingly is here numbered as the first Earl of Mar. However it is not known if a bloodline existed in the succession of the early Mormaers of Mar, so it cannot be said for certain that Rothri was their descendant, just that he was their successor.
Mar with Buchan (the territory comprising that now covered by the counties of Aberdeen and Banff) formed one of the seven original Earldoms of Scotland, the holders of which were styled Mormaers in the 10th and 11th centuries, and later called Earls. Before the 12th century Buchan had become separated from Mar.