Why the ancient personification of terror now orbits the red planet

Ideas & Philosophy · Published 29 September 2026 Swipe more like this →

In short: In Greek mythology, Deimos is the literal embodiment of fear, a constant companion to the god of war. While he once haunted the battlefields of antiquity, his name was later claimed by astronomers to describe a celestial body. Discover how this ancient deity transitioned from myth to Martian moon.

Deimos, whose name translates directly from Ancient Greek as fear, occupies a significant place in the mythological lineage of Ares and Aphrodite. According to Hesiod’s Theogony, he is the sibling of Phobos and Harmonia. While he is primarily recognized as the personification of dread, some ancient accounts, such as those by the antiquarian Semus of Delos, attribute a more monstrous lineage to him, identifying him as the father of Scylla.

In literature, Deimos serves as a tactical shadow to his father, Ares. He is frequently depicted alongside his brother Phobos, who represents panic. In the Iliad, they join Ares and Eris, the goddess of discord, to sow chaos among armies. Their presence was so iconic that they were famously depicted on the shield of Agamemnon. In the Shield of Heracles, the pair even assists in removing a wounded Ares from the battlefield. Later writers expanded these roles; for instance, Nonnus describes them wielding lightning and thunder to terrify the monster Typhon, while Antimachus famously, if inaccurately, reimagined them as the horses of Ares.

The transition of Deimos from a mythological figure to a physical reality occurred in 1877. When Asaph Hall, an American astronomer, identified the two moons circling Mars, he chose to immortalize the war god’s companions by naming them Phobos and Deimos. Today, Deimos remains the smaller of the two satellites. This naming convention bridges the gap between the ancient world’s obsession with the psychological weight of war and the modern scientific endeavor to map the solar system, ensuring that the personification of fear remains forever linked to the planet named for his father.

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