In 1054 Siward invaded Scotland in the interests of his kinsman Malcolm Canmore, and he completely routed King Macbeth in a battle in which his son Osbeorn was killed.
Forfar is at least as old as the time of Malcolm Canmore, for the first parliament after the defeat of Macbeth met in the old castle, which stood on a mound on the northern side of the town.
After the death of Gilcomgain, Gruach wedded Macbeth, Mormaor (or earl in later style) of the province or subkingdom of Moray; Macbeth slew Duncan, and ruled as protector of the legitimate claims of Lulach.
Between this drama and its successor, Die Brazil von Messina, Schiller translated and adapted to his classic ideals Shakespeare's Macbeth (1801) and Gozzi's Turandot (1802).
The feud between these two princes originated probably in a dispute over the succession to the throne; its details, however, are obscure, and the only fact which can be ascertained with any certainty is that Duncan was slain by Macbeth in 1040.
Another storied stone is called the Witches' Stone, because it marks the place near Forres where Macbeth is said to have encountered the weird sisters.
The passage in Macbeth (Act 11.
Dunimarle Castle, a handsome structure on the sea-shore, adjoins the site of the castle where, according to tradition, Macbeth slew the wife;and children of Macduff.
He put down the Scottish usurper Macbeth with the swords of a Northumbrian army, and restored Malcolm III.
Duncan left sons, Malcolm, called Canmore (great head), and Donald Ban; and in 1054 Siward, earl of Northumbria, defeated Macbeth, whether acting under the order of Edward the Confessor in favour of the claims of Malcolm Canmore, or merely to punish Macbeth for sheltering Norman fugitives from the Confessor's court.