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 subsequently fulfills a linking function between deities. This entity also appears in Act 1, Scene 6 of Shakespeare's Macbeth, where King Duncan and Banquo refer to it as 'a guest of summer' and mistake it for a favorable omen when they see it outside Macbeth's castle shortly before Duncan is killed.