[2] Donald, Mormaer of Mar fought alongside the High King of Ireland, Brian Boru, against the Viking invaders at the Battle of Clontarf in 1014.
[2] 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.
[2] William's son was Domhnall (Donald) I who was knighted at Scone in September 1270 by Alexander III of Scotland.
[2] Donald witnessed the contract of marriage between Eric II of Norway and Margaret of Scotland.
[2] Donald also acknowledged Eric's daughter, Margaret, Maid of Norway as the lawful heir to the throne.
[2] In the dead of night the English fell upon the Scots army while they were asleep and totally routed them.
[2] Donald's son, the next earl, Thomas, died without issue and the title passed to Margaret, Countess of Mar who was his sister.
[2] The family estates were forfeited for their support of the royalists but were later restored by Charles II of England in 1660.