Deiphobus is a son of Priam and Hecuba.
When Heracles killed Iphitos in a fit of madness, Deiphobus purified him.
He appears in one battle in the Iliad, fighting alongside Aeneas and killing several men. When Hector is running from Achilles, Athena impersonates Deiphobus to trick Hector into facing Achilles.
Later, after the death of Paris, he and his brother Helenus both attempt to become her new husband. She was given to Deiphobus. Angered, Helenus leaves the city for Mt. Ida. At the fall of Troy, he is killed by Menelaus.