Ares was the Greek god of war. He is one of the Twelve Olympians, and the son of Zeus and Hera. In Greek literature, he often represents the physical or violent aspect of war, in contrast to the armored Athena, whose functions as a goddess of intelligence including including military strategy and generalship.
In all the myths concerning Ares, his sister Athena ever appears in opposition to him, endeavouring by every means in her power to defeat his bloodthirsty designs. Thus she assists the divine hero Diomedes at the siege of Troy, to overcome Ares in battle, and so well does he profit by her timely aid, that he succeeds in wounding the sanguinary war-god, who makes his exit from the field, roaring like ten thousand bulls.
Although hated and feared, Ares was honored by all great warriors, even Herakles.
Ares rode into battle on the side of the Trojans with his horses, Flame and Terror, pulling his war chariot. He swooped down to help Aphrodite defend her son Aineias (The Iliad 5.355) and saved him from sure death at the hands of the Achaians. While Ares protected Aineias with his shield, Aphrodite made her escape to Mount Olympus to tend her wounds.
The Greek goddess of love was, at the time, involved with another at Mt. Olympus when she and Ares had their fling; thus the two tried to keep their dalliances secret. One legend says that, one night when the two met, Ares assigned a youth, Alectryon, to stand guard at the door and warn Ares if Helios (the Greek personification of the Sun) came near, as Helios would spread the tale. Alectryon fell asleep and Helios caught the two lovers. As punishment Ares had Alectryon turned into a rooster, and to this day roosters never fail to warn of the coming of the Sun.
ARES was the great Olympian god of war. He possessed very few temples and shrines in the ancient world, but was apparently honoured with rites in times of war. His cult seems to have been centred on the northern regions of Greece--Thessaly, Thesprotia and Thrake. However, there are no descriptions of these regions comparable in detail to Pausanias' account of the Peloponnese which might shed light on the cult of Ares in the north. In classical sculpture Ares was represented as a handsome man, often nude, but wearing a Greek helm, and holding a spear or sword.
Ares' unpopularity was probably inevitable, given that the Greeks of that time were mostly involved in petty wars amongst themselves, wars where allegiances were unclear and shifted frequently. Any god of war would have found it very difficult to please everyone in that situation! It's easy to see why Ares' other incarnation, as Mars, the Roman God of War, fared much better -- the Roman viewpoint was no doubt influenced by the fact that Rome was usually at war with foreign powers so that a god of war could be someone that could be worshipped and viewed as heroic, one always battling for a just cause (i.e., their side).
Ares never developed into a god of social, moral or theological importance, in this respect contrasting sharply not only with Apollo but with the Italian Mars, with whom he was identified in Graeco-Roman cult and legend; for Mars had agricultural as well as warlike functions, however he came by them, and , at least in in the Augustan cult of Mars Ultor, he was capable of embodying the idea of righteous vengeance, while his Greek counterpart was no more than a divine swashbuckler.
Ares, god of war, was blood and brutal. Even his farther, Zeus (In HOMER's ILIAD), declared that he hated his son for his perpetual violence and aggression. Ares was not always successful in battle and was often thought of as cowardly and inept.
Ares is the son of Zeus and Hera. He was disliked by both parents. He is the god of war. He is considered murderous and bloodstained but, also a coward [...] His bird is the vulture. His animal is the dog.
Ares was of giant stature and had a loud voice, and surpassed the other gods in speed. He usually fought on foot, but could sometimes be found riding a chariot. On the battlefield Ares was accompanied by Phobos ("Fear") and Deimos ("Terror"), two lesser divinities who are sometimes given as his sons. He was furthermore attended by the goddesses Eris ("Strife") and Enyo ("Horror").
Ares is the god of warrior fury that runs riot. […] Ares is excess and lack of control; dedicated o the warrior function, he is the dominant force of the Bronze race; and all that comes from him bears the exclusive mark of war.