Donalbain’s few lines in the play carry weight as they contribute to the theme of distrust and the importance of prudence in a world rife with treachery. His character, though not as developed as others, serves as a foil to the naivety of his father, King Duncan, and the unchecked ambition of Macbeth. Donalbain, though a minor character in Shakespeare’s “Macbeth,” provides insight into the themes of trust and betrayal.