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.

Fordoun is a parish and village in Aberdeenshire, Scotland. Fothirdun, as it was historically known, was an important area in the Howe of the Mearns. Fordoun and Auchenblae, together with their immediate districts form the Parish of Fordoun with the Parish Church in the vicinity of the original settlement, now absorbed by Auchenblae.