The family tree of Mars, the Roman god of war, centers on his parentage as the son of Jupiter and Juno, making him a member of the first generation of Olympian deities in Roman mythology. His most famous union was with Venus, the goddess of love, and their notable children include Cupid, Harmonia, and the twins Phobos and Deimos, though his most celebrated offspring in Roman legend are Romulus and Remus, the mythical founders of Rome.
Origins: Jupiter and Juno
In standard Roman mythology, Mars is the son of Jupiter, the king of the gods, and Juno, his wife and sister. This makes him a full brother to other major deities such as Vulcan, Juventas, and Lucina. However, an alternative tradition, recorded by the Roman poet Ovid in his Fasti, tells a different story: Juno, jealous of Jupiter’s ability to give birth to Minerva from his head, sought to conceive a child on her own. The goddess Flora gave her a magical flower, and touching it made Juno pregnant with Mars. In this version, Mars has no father, born solely from his mother’s will, a rare case of parthenogenesis among Roman gods.
Unlike the Greek Ares, whom the Romans partially identified with, Mars held a far more honored place in Roman society. He was not only a god of war but also a guardian of agriculture and the Roman state, reflecting his deep roots in early Roman rural life. His position as the son of the supreme god and the consort of Venus placed him at the heart of Rome’s founding mythology.
Consorts and Offspring
Mars’s most significant consort in mythology is Venus, the goddess of love and beauty. Their union represents a symbolic marriage of war and love, and their children embody the blend of these forces. According to Hesiod’s Theogony (though he writes of Ares, the Greek equivalent), the children of this union include:
- Harmonia – the goddess of harmony and concord, who married Cadmus, the founder of Thebes.
- Phobos – the personification of fear and panic, often depicted accompanying his father in battle.
- Deimos – the personification of terror and dread, also a constant companion of Mars in warfare.
- Eros/Cupid – the god of love, though in some traditions he is the son of Venus and Mercury, not Mars.
- Anteros – the god of requited love, sometimes listed as a son of Mars and Venus.
Beyond Venus, Mars had other consorts in various myths. With the Vestal Virgin Rhea Silvia, he fathered the twins Romulus and Remus, who were central to Rome’s foundation. This story, told by Livy and Plutarch, holds that Mars appeared to Rhea Silvia in a sacred grove, and she conceived the twins. After their birth, they were abandoned and raised by a she-wolf, eventually founding the city of Rome.
The Roman Foundation Myth: Romulus and Remus
The most politically important branch of Mars’s family tree is his role as the divine ancestor of the Roman people through Romulus. According to the standard account, Romulus and Remus were born to Rhea Silvia, the daughter of Numitor, the deposed king of Alba Longa. Her uncle, Amulius, had taken the throne and forced her to become a Vestal Virgin to prevent her from having heirs. Mars’s intervention, however, thwarted Amulius’s plan.
The twins were thrown into the Tiber River but survived, washed ashore, and were suckled by a she-wolf (the lupa) until a shepherd named Faustulus found and raised them. As adults, they restored Numitor to the throne and then decided to found a new city. A dispute over where to build it led to Romulus killing Remus, and Romulus became the first king of Rome. This myth gave the Roman people a direct divine lineage, with Mars as their ancestor, which was a powerful political and religious claim of legitimacy.
Mars in the Greek Tradition: Ares
To understand Mars’s family tree fully, it is helpful to compare him with his Greek counterpart, Ares. The Romans adopted many Greek myths and applied them to their own gods, but they also adapted them. In Greek mythology, Ares is the son of Zeus and Hera, and he is the lover of Aphrodite (Venus). The children listed above—Harmonia, Phobos, Deimos, and Eros—are all attributed to Ares and Aphrodite in Greek sources, particularly in Hesiod’s Theogony and Homer’s Odyssey.
However, the Romans gave Mars a more dignified character. While Ares was often portrayed as a brutal and disliked god, Mars was revered as a protector of agriculture and a father of the Roman nation. This difference is reflected in the names of the planets: Mars is the red planet, but the moons of Mars are named Phobos and Deimos, after his sons, a naming convention that stuck from the Roman tradition.
Other Children and Lesser-Known Offspring
In addition to the well-known children, Mars is credited with several other offspring in various myths, though these are less prominent:
- Alcestis – in some rare traditions, she is said to be a daughter of Mars, though the more common myth makes her the daughter of Pelias.
- Cycnus – a son of Mars who was a notorious bandit, killed by Heracles in a battle that drew Mars’s wrath.
- Diomedes of Thrace – another son of Mars, known for his man-eating horses, which were captured by Heracles as one of his labors.
- The Amazons – in some accounts, the Amazons are said to be daughters of Mars, particularly their queen, Hippolyta, though this varies.
These figures often appear in myths as antagonists to Greek heroes, reflecting Mars’s combative nature. However, they are not central to Roman state religion, which focused on Mars’s role as a national protector.
Mars in Roman Cult and Family Life
Mars’s family tree was not just a mythological curiosity; it had direct implications for Roman religious practice. The Salii were a college of priests dedicated to Mars, who performed ritual dances and sang hymns to him during the month of March (named after him). The Lupercalia, a festival held in February, was associated with the she-wolf that nursed Romulus and Remus, and thus with Mars’s role as their father.
In the Roman household, Mars was invoked as a protector of the fields and the family property. His association with agriculture made him a domestic deity as much as a military one. The paterfamilias (male head of household) would offer prayers to Mars for the fertility of crops and livestock, linking his divine family to the everyday concerns of Roman citizens. This dual role is unique to Mars; his Greek counterpart Ares never had such a civic function.
Frequently Asked Questions
Who are Mars’s parents in Roman mythology?
Mars is the son of Jupiter and Juno, the king and queen of the Roman gods. This makes him a full brother to Vulcan and Juventas. However, Ovid’s Fasti offers an alternative: Juno conceived Mars alone by touching a magical flower, so in that version, he has no father.
Did Mars and Venus have children?
Yes, Mars and Venus had several children, including Harmonia, Phobos, Deimos, and sometimes Cupid (Eros). The most famous are Phobos and Deimos, who are the namesakes of the two moons of Mars. Harmonia is notable for marrying Cadmus, the founder of Thebes.
How is Mars related to Romulus and Remus?
Mars is the divine father of Romulus and Remus, the twin founders of Rome. He impregnated Rhea Silvia, a Vestal Virgin, while she was in a sacred grove. The twins were later abandoned, saved by a she-wolf, and went on to found the city, making Mars the ancestor of the Roman people.
Is Mars the same as the Greek god Ares?
Mars is the Roman equivalent of the Greek god Ares, and the Romans adopted many Greek myths about Ares and applied them to Mars. However, Mars had a more honorable and important role in Roman religion, being a protector of agriculture and the state, whereas Ares was often portrayed negatively in Greek myths.
What are the names of Mars’s sons who accompany him in battle?
Phobos (fear) and Deimos (terror) are the two sons of Mars who accompany him on the battlefield. They are the personifications of the emotions that grip soldiers in combat. Their names were given to the two moons of the planet Mars.
Did Mars have any daughters?
Yes, Mars is sometimes said to have daughters, including Harmonia (goddess of harmony) and, in some traditions, the Amazon queen Hippolyta. However, these genealogies vary between sources, and Harmonia is the most consistently listed daughter.
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