Deimos (//; Greek: Δεῖμος - "dread" or "terror") is the god of terror in Greek mythology. He is one of the sons of Ares and Aphrodite. He is the twin brother of Phobos, god of fear. He and his brother would often go with their father as he rode into battle in his chariot. Deimos, the smaller of Mars' two moons, is named after him.