Mars was the Roman god of war, equivalent to Ares in Greek Mythology, and also an agricultural guardian, a combination characteristic of early Rome. He was the most prominent of the military gods worshipped by the Roman legions.
Mars, God of war, and chief God of the Roman State, is the analogous to the Greek God Ares. Although the Romans reinterpreted the identity of Ares, in the sense that he is now doesn't embody the characteristics of Ares in his entirety.
Mythology - Ares had a miserable childhood. The only son of the mighty Zeus, ruler of the Olympians, and his wife Hera, Ares was disliked by his father from the moment he was born and was barely tolerated from then on.