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Donaldbain
Macbeth character
Illustration of Donaldbain, Dorothy Carleton Smyth (c. 1900)
Created by	William Shakespeare
Based on	Donald III of Scotland
In-universe information
Affiliation	Loyal to King Duncan and Malcolm
Family	King Duncan, father Malcolm, elder brother Macbeth, father's cousin

Donaldbain is a character in William Shakespeare's Macbeth (c. 1603–1607). He is the younger son of King Duncan and brother to Malcolm, the heir to the throne. Donaldbain flees to Ireland after the murder of his father for refuge.^[1] He is ultimately based on the historical King Donald III of Scotland.

In the original text of the First Folio his name is spelled Donaldbaine, and is sometimes also spelled Donalbain. His name is derived from the Scottish Gaelic Dòmhnall Bàn, "Donald the Fair."

Donaldbain is based on 'Donald Bane' from Holinshed's Chronicles (1587). He only appears after King Duncan is murdered.^[1] Holinshed's historical personage is Donald III of Scotland.

Historically, Donaldbain (Donald Ban/Donald the Fair) seized the Scottish throne after the death of Malcolm and reigned intermittently a few years but was ultimately succeeded by Malcolm's son Edgar.

Donaldbain appears in a few early scenes in the entire play, speaking only when his brother decides to seek refuge in England, while he seeks refuge in Ireland. Donaldbain tells Malcolm that their "separated fortune / Shall keep us both the safer".

Although it is easy to argue that Donaldbain does not contribute to the play, granted his lack of appearance, he plays his role by supporting Malcolm as his brother and Duncan as his father. He is also a boost to the King's character, as neither of his sons are involved in foul play in the play.

The ending of Roman Polanski's film adaptation of Macbeth, in which Donaldbain, returning to Scotland after the death of Macbeth, hears the witches murmuring in the heather and gets off his horse to investigate, alludes to the historical fact that Donald III seized the throne after the death of Malcolm.^{[citation needed]}

• Macbeth: Folio Version
• Macbeth: Full-text online