Mars

Mars (Latin Mars, Mavors) was the Roman god of war, second only to Jupiter in importance and dignity, and one of the most distinctively and profoundly Roman of all the gods. Far more than a mere counterpart to the Greek Ares — whom the Greeks themselves regarded with a measure of contempt — Mars was a revered and beloved deity, the divine father of Romulus and Remus and thus the progenitor of the Roman people themselves, a guardian of the state, and, in his ancient aspect, a god of agriculture and the protection of the fields. His cult stood at the very center of Roman civic and military identity, wound into the calendar, the priesthood, the topography of the city, and the rituals that carried Roman armies to war and, ideally, safely home again.

The Father of the Roman People

Mars held a unique place in Roman religion as the literal divine ancestor of the Roman people. According to the foundational legend of Rome, Mars was the father of the twins Romulus and Remus, whom he begot upon the Vestal Virgin Rhea Silvia; Romulus went on to found the city of Rome and become its first king, making Mars the divine progenitor of the Romans and the grandfather of the city itself (Livy 1.4; Plutarch, Life of Romulus). This ancestral role gave Mars a deeply personal and patriotic significance for the Romans that the Greek Ares never possessed for the Greeks. When the infant twins were abandoned and left exposed on the banks of the Tiber, it was a she-wolf, the lupa, sacred to Mars, who found and suckled them, an image that became the enduring emblem of Rome itself and a direct testament to Mars's paternity. The wolf, together with the woodpecker, was counted among Mars's sacred animals, both creatures bound up in the mythic landscape of early Latium through which the god's presence was said to move.

The God of War and Roman Valour

As the god of war, Mars presided over the military life that was so central to the Roman world. The month of March (Martius), named for him, marked the traditional opening of the campaigning season and was, in the earliest Roman calendar attributed to Numa Pompilius, the first month of the year, the moment when armies mustered and marched out to war (Ovid, Fasti 3; Plutarch, Numa). The month was filled with festivals and rituals in Mars's honour, conducted by his ancient priests, the twelve leaping, dancing Salii, or "leaping priests," who processed through the city bearing the sacred shields known as the ancilia. Tradition held that one of these shields had fallen from the sky as a divine sign to King Numa (Livy 1.20; Ovid, Fasti 3). Before going to war, a Roman general would ritually shake the sacred spears of Mars kept in the Regia, crying out "Mars vigila" — "Mars, awake" — a formula preserved by the commentator Servius in his notes on Virgil, invoking the god's active attention before a campaign began. Mars embodied the courage, discipline, strength, and martial virtue (virtus) that the Romans prized above almost all else, and which they credited for their conquest of the known world.

Chief Priest and Sacred Office

Mars's importance in the state religion was formalized through one of Rome's oldest and most prestigious priesthoods, the Flamen Martialis. This office was one of the three major flamines — alongside the priests of Jupiter and Quirinus — established under the early religious system traditionally attributed to King Numa Pompilius. The Flamen Martialis was devoted entirely to the maintenance of Mars's cult, underscoring how central the god of war was considered to the well-being and continuity of the Roman state.

Mars the Protector of the Fields

In one of his oldest and most distinctive aspects, Mars was not only a god of war but a god of agriculture and the protection of the fields — a guardian deity, as the antiquarian Varro records in his De Lingua Latina, who ranked second only to Jupiter in the Roman state cult. This dual character reflects the figure of the early Roman warrior-farmer, who both tilled the land in peace and defended it in war, a duality the Romans never fully separated even as Mars's martial identity came to dominate his public image.

The Sacred Field of Mars

Mars's presence was written into the very geography of Rome through the Campus Martius, the "Field of Mars," a large public area used for military training, popular elections, and, in later centuries, monumental building, named in his honour.

The Twice-Yearly Horse Races

Among the festivals held in Mars's honour on the Campus Martius was the Equirria, a ritual of horse-racing celebrated twice each year, on February 27 and again on March 14, as described by Ovid in the Fasti. These races, run on the very field that bore Mars's name, served as a preparation for the coming campaign season and as a public act of devotion to the god of war.

Mars Ultor, the Avenger

Centuries after Rome's founding, Mars acquired a striking new epithet and one of his most magnificent sanctuaries: Mars Ultor, "Mars the Avenger." The emperor Augustus vowed a temple to Mars in this aspect before the Battle of Philippi, pledging to build it if he succeeded in avenging the assassination of his adoptive father, Julius Caesar. Augustus fulfilled that vow with the construction of the Temple of Mars Ultor at the heart of the Forum of Augustus, dedicated in 2 BCE, as Suetonius records in his biography of Augustus.

Mars and Venus

Despite his martial severity, Mars was also woven into one of Roman mythology's most memorable romantic episodes: his love affair with Venus, the goddess of love, who was married to the smith-god Vulcan. According to the story recounted in Homer's Odyssey (Book 8) and retold by Ovid in the Metamorphoses (Book 4), Vulcan discovered the affair and, rather than confronting the lovers directly, forged an invisibly fine golden net with which he trapped Mars and Venus together in the act, then summoned the other gods to witness their humiliation. The tale, for all its comedy among the Olympian gods, paired the two deities most associated with love and war in the Roman imagination.

Mars Compared to Ares

The contrast between the Roman Mars and the Greek Ares is striking and revealing. The Greeks, for all that Ares was counted among the Olympian gods, generally viewed him negatively, a deity more feared than loved. The Romans, by contrast, held Mars in the highest honour, as a noble and dignified god, the father of their people and a central figure of state religion. This reflects the broader Roman practice of syncretizing native Italic deities with their Greek equivalents while still preserving distinctly Roman meanings and associations; just as Juno, identified with the Greek Hera, retained a uniquely Roman civic and maternal character as queen of the Capitoline Triad, so too did Mars, identified with Ares, retain a gravity and centrality in Roman state religion that his Greek counterpart never enjoyed. Mars was, after Jupiter, perhaps the most important god of the Roman state, a position confirmed by his priesthood, his festivals, and his role as the mythic father of Rome's very founder.

Mars in the Household of the Gods

As with so many figures in the Roman pantheon, Mars's identity was shaped by his place within a larger divine family understood through the lens of Greek myth: Mars, in his Hellenic guise as Ares, was counted as a son of the sky-father Zeus and his wife Hera, mirrored in Roman religion by Jupiter and Juno. This inherited genealogy linked Mars by kinship to Juno not only as his mother but as the queen of the gods herself, reflecting the broader Roman practice of syncretizing native Italic deities with Greek mythology.

Legacy

Mars endures as one of the most powerful and recognisable of all the Roman gods, his name given to the month of March, the season of campaigning he presided over as the original opening of the Roman calendar year. From the wolf-suckled twins on the banks of the Tiber to the gleaming Temple of Mars Ultor in the heart of imperial Rome, and through his enduring priesthood, festivals, and shrines, Mars's cult expressed the Roman state's understanding of itself as founded, defended, and sustained by the god of war.