One of the two sons of Zeus and Hera. Ares is the brother of Hephaestus and Hebe. Ares is a god of war, but a far different type of war than Athena. Ares is usually associated with fighting such as the sacking of a city or slaughtering of civilians. He is often associated with Aphrodite, the wife of his brother Hephaestus. He is usually accompanied in battle by Pain and Panic, his sons with Aphrodite. Later myths also have Eros being a son of their union.
The Greeks despised Ares. The Romans, on the other hand, associated him with their war god Mars. The founder of Rome, Romulus, was in fact said to be his son. Mars was a god to be revered, unlike the chaotic despoiler Ares.