Dunnottar Castle is a ruined medieval fortress located upon a rocky headland on the north-eastern coast of Scotland, about 2 miles south of Stonehaven. The surviving buildings are largely of the 15th and 16th centuries, but the site is believed to have been fortified in the Early Middle Ages. Dunnottar has played a prominent role in the history of Scotland through to the 18th-century Jacobite risings because of its strategic location and defensive strength.

Domnall mac Causantín, anglicised as Donald II, was King of the Picts or King of Alba in the late 9th century. He was the son of Constantine I. Donald is given the epithet Dásachtach, "the Madman", by the Prophecy of Berchán.