Donald II of Scotland

Donald II
18th-century depiction of Donald
King of the Picts, or of Alba
Reign	889–900
Predecessor	Giric
Successor	Constantine II
Died	900 Forres or Dunnottar
Burial	Iona
Issue	Malcolm I, King of Alba
House	Alpin
Father	Constantín mac Cináeda, King of the Picts

Domnall mac Causantín (Modern Gaelic: Dòmhnall mac Chòiseim),anglicised as Donald II (died 900) was King of the Picts or King of Scotland (Alba) in the late 9th century. He was the son of Constantine I (Causantín mac Cináeda). Donald is given the epithet Dásachtach, "the Madman", by the Prophecy of Berchán.

Donald became king on the death or deposition of Giric (Giric mac Dúngail), the date of which is not certainly known but usually placed in 889. The Chronicle of the Kings of Alba reports:

Doniualdus son of Constantini held the kingdom for 11 years [889–900]. The Northmen wasted Pictland at this time. In his reign a battle occurred between Danes and Scots at Innisibsolian where the Scots had victory. He was killed at Opidum Fother [modern Dunnottar] by the Gentiles.

It has been suggested that the attack on Dunnottar, rather than being a small raid by a handful of pirates, may be associated with the ravaging of Scotland attributed to Harald Fairhair in the Heimskringla. The Prophecy of Berchán places Donald's death at Dunnottar, but appears to attribute it to Gaels rather than Norsemen; other sources report he died at Forres. Donald's death is dated to 900 by the Annals of Ulster and the Chronicon Scotorum, where he is called king of Alba, rather than king of the Picts. He was buried on Iona. Like his father, Constantine, he died a violent death at a premature age.