MarsRoman god of war, thus symbol of a society that for centuries was thought of as essentially belligerent. Mars was identical with Greek Ares, although Ares never had a notorious position in the Greek pantheon. One of the most prominent and worshiped gods of Rome, Mars lent his name to a Roman district, the Campus Martius (Field of Mars), which announces even today his status as the city's protector and as father of the Roman people. Romulus, one of his twin sons born to the Vestal virgin Rhea Silvia, legendarily founded the city.
In the postclassical era Servius's commentary on Virgil's Aeneid (1.292) was the major source of knowledge of Mars's dual role as a keeper both of war and of peace. Servius refers to two temples of Mars: one outside the city that served as a temple for warriors, dedicated to Mars Gradivus, the god "that walks in battle"; the other inside the city, charged with guarding tranquility and dedicated to Mars Quirinus. (Originally, in old Italian beliefs, Mars had been associated with fertility, vegetation, and the protection of cattle; he became fused with Quirinus, previously the Sabine god of war.) Vitruvius (2.8.11), writing in the 1st century bce, mentions a colossal acrolithic statue of Mars (a draped or gilded wooden body with marble head and extremities) that stood in a temple atop a hill in Halicarnassus.