Mars was the Roman god of war.

Mars was the Roman god of war, the son of Juno and Jupiter. His name is likely derived from that of the Etruscn deity, Maris. Mars was the tutelatory god of the City of Rome and according to legend was the father of Romulus, the founder of Rome.

Because of the god Mars's association with the foundation of Rome, Mars was the most widely worshipped of the Roman gods.

The English word martial (pertaining to war and armies) is derived from the name of the god Mars.