The Trojan royal who lived

After Paris died, his brothers Helenus and Deiphobus fought their claim over Helen. Priam gave her to Deiphobus, Helenus was angry and left Troy to join the Greeks. He was an oracle and helped the greeks secure victory by three tasks- getting the bones of Pelops, securing the services of Pyrrhus, son of Achilles and stealing a sacred image of Athena located in Troy. The three tasks were completed thus securing the victory of the Greeks.