What are three examples of doppelgangers from ancient world literature?

Question

We've read Gilgamesh, The Illiad, The Odyssey, The Bible, The Qur'an, Rumi, the Ramayana, Sir Gawain and the Green Knight, Confucious, Aristotle, Sappho, Catullus, ect....ancient World Literature, what would be examples of doppelgangers in any of these stories and what characters would they be?

Answer 1

I only know of Percy Bysshe Shelley's reported sighting a doppelganger before his death, but he wasn't a literary character; he was a Romantic poet. Does that help?