MacDonald Per Mare Per Terras (By Sea By Land) As they were Lord of the Isles. I beleive the Canadian motto A Mari usque ad mare from sea to sea was from Sir John A Macdonald.
Or Clan Ranald My Hope is Constant in Thee. Reputable uttered of by the Bruce at Bannockburn. and giving Macdonalds the prefered place of honour on the right of the line of Battle.