Thereafter it performs a linking role as a messenger of the Gods. It also appears in Shakespeare's Macbeth Act 1 Sc 6, when King Duncan and Banquo call it a 'guest of summer' and see it mistakenly as a good omen when they spot it outside Macbeth's castle, shortly before Duncan is killed.
It then takes on the role of linking between deities. This entity also appears in Act 1, Scene 6 of Shakespeare's Macbeth, where King Duncan and Banquo call it 'a guest of summer' and interpret it as a good omen when they spot it outside Macbeth's castle just before Duncan is murdered.