 The territory of the Earldom of Mar was in Aberdeenshire, between the River Dee and the River Don.Donald, Mormaer of Mar fought alongside the High King of Ireland, Brian Boru, against the Viking invaders at the Battle of Clontarf in 1014.In a charter of 1114, erecting Scone Abbey, Rothri, Mormaer of Mar is named and is given the Latin title "Comes" which equates to the modern rank of Earl.