The God of War
Mars was the son Jupiter (Zeus) and Juno (Hera). Both of them supposedly hated their son. His sister is Eris (Discord), and his nephew is Strife. He walks with Bellona (Enyo), the goddess of war. She brings with her Terror, Trembling, and Panic. Where ever they walk, groans are heard, and blood streams arise.
Romans liked the god Mars more than the Greeks liked Ares, his Greek counter-part. There are many differences between the Greek god of war and the Roman god of war. In Greek, Ares is a whining and uncaring deity, but in Roman mythology, Mars is a brave and wonderful warrior. There were however, no special cities where mars was worshipped and he was vaguely said to come from Thrace.
There is a story where Mars had an affair with Venus (Aphrodite), but was shamed and brought to justice by her husband, Vulcan (Hephaestus). His animal is a vulture, and the other animal is a dog. This lead to the saying, "Let loose the dogs of war."