Mercury (mythology)

• 1. Introduction

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  Mercury stands at a crossroads that no map can show: the boundary between the living and the dead, between buyer and seller, between the world of gods and the world of thieves. He was one of the twelve Dii Consentes, the inner council of Roman religion, and his list of responsibilities reads like a contradiction. Commerce and trickery. Eloquence and luck. Travelers and the souls of the newly deceased.

  His name may descend from the Latin word merx, meaning merchandise, the same root that gives us merchant and commerce. Or it may reach back to a Proto-Indo-European word for boundary and border, a term that echoes through Old English, Old Norse, and even Mongolian, where a word for border and a word for market were the same thing.

  How did one god come to hold all of this together? And what does it tell us about the Romans that this singular, slippery figure was, by some accounts, the most popular god in their entire empire?

• 2. A God of Boundaries

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  Julius Caesar wrote that Mercury was the most popular god in Britain and Gaul, regarded by those peoples as the inventor of all the arts. That claim, written by a Roman general describing the lands he was conquering, reveals something important about how Rome understood its own gods.

  Mercury was not among the earliest Roman deities, the numinous di indigetes of the most ancient religious tradition. He arrived later, absorbed into Roman religion during the time of the Roman Republic, starting around the 4th century BC, as part of the great syncretism with Greek religion. He was classified as one of the Di Novensides, the New Gods, of Greek origin.

  From the beginning, his Greek counterpart was Hermes. Mercury wore the same winged shoes, called talaria, and the same winged hat, called the petasos. He carried the same caduceus, the herald's staff with two entwined snakes, which had originally been Apollo's gift to Hermes. His companions were a rooster, a ram or goat, and a tortoise, the last a reference to his legendary role in inventing the lyre from a tortoise shell.

  Archaeological evidence from Pompeii suggests he was among the most popular Roman gods. The god of commerce appeared on two early bronze coins of the Roman Republic, the sextans and the semuncia.

• 3. The Problem of the Temple

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  Mercury's temple in Rome was built in 495 BC. It stood in the Circus Maximus, between the Aventine and Palatine Hills, two hills whose very names carried political weight in the Roman world.

  The year of its construction was an unstable one. Disturbances between the patrician senators and the plebeians were coming to a head, and they would lead to a secession of the plebs the following year. When the temple was finished, a dispute broke out between the two consuls, Appius Claudius Sabinus Regillensis and Publius Servilius Priscus Structus, over which of them should have the honor of dedicating it.

  The Roman Senate referred the decision to the popular assembly, and decreed that whichever consul was chosen should also hold additional responsibilities: presiding over the markets, establishing a merchants' guild, and performing the functions of the pontifex maximus. The people, stung by the ongoing political discord, chose to spite both the senate and the consuls. They gave the dedication to Marcus Laetorius, the senior military officer of one of the legions. The conservative Appius and the senate were outraged. The decision inflamed an already volatile situation.

  The dedication took place on the 15th of May, 495 BC. The temple's location between the plebeian stronghold on the Aventine and the patrician center on the Palatine was read as deliberate: the god of trade could serve as a mediator between warring classes. The festival of Mercury, the Mercuralia, fell on that same date, the 15th of May. On that day, merchants sprinkled water from his sacred well near the Porta Capena on their own heads.

• 4. Many Names, One God

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  An altar in Bonn, Germany carries an inscription to Mercurius Gebrinius, a fusion of Mercury with a Celtic or Germanic deity named Gebrinius. The same pattern of fusion, mercury absorbing a local god while lending him a Roman framework, repeated itself across the entire extent of the Roman Empire.

  The Romans called this practice the interpretatio romana: when encountering the gods of Celtic and Germanic tribes, they did not treat them as foreign or alien. They read them as local versions of their own gods. Mercury, in particular, drew more of these fusions to himself than almost any other deity.

  In Gaul and among the Germanic tribes, Mercury was equated with the Celtic god Lugus, and in that aspect was often accompanied by the Celtic goddess Rosmerta. Lugus may have originally been connected to light or the sun, closer in nature to Apollo. But his strong association with trade pulled him into Mercury's orbit instead. The 1st-century Roman writer Tacitus identified the Germanic god Wotan as Mercury's equivalent, and that identification left a permanent mark on the English language: Wednesday takes its name from Wotan, while the French Mercredi preserves Mercury directly.

  The list of Mercury's named syncretisms runs long. Mercurius Artaios fused him with a Celtic deity of bears and hunting, worshipped at Beaucroissant in France. Mercurius Cissonius combined him with a god attested in inscriptions from Cologne, Germany to Saintes, France. Mercurius Moccus drew on a Celtic pig deity from Langres, France whose name implied a connection to boar-hunting. Mercurius Esibraeus derived from an Iberian inscription found at Medelim, Portugal. And Mercurius Sobrius, Mercury the Teetotaler, merged him with a Carthaginian god of commerce.

• 5. Guide of Souls and Storyteller

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  Ovid wrote that Mercury carried the dreams of the god Morpheus from the valley of Somnus to sleeping humans. That role as a messenger crossing between states of consciousness sits alongside his better-known function as psychopomp, the guide who led newly deceased souls to the afterlife.

  In Virgil's Aeneid, Mercury appears to Aeneas to remind him of his mission to found the city of Rome. The god does not simply deliver a message; he redirects the fate of a civilization. In Ovid's Fasti, Mercury is assigned to escort the nymph Larunda down to the underworld. On the way, Mercury falls in love with Larunda and makes love to her. From that encounter, Larunda becomes the mother of two children referred to as the Lares, the invisible household gods who watched over Roman homes.

  These literary portraits make Mercury something more complicated than a deity of commercial exchange. He moves between worlds, bends rules, falls in love during divine errands, and carries both dreams and the dead. The story of the Lares' parentage also positions Mercury as an origin point for one of the most intimate aspects of Roman domestic life, the small gods that lived within the home itself.

• 6. Mercury's Lasting Impressions

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  Jack Kirby's first published comic book story, Mercury in the 20th Century, appeared in Red Raven Comics 1 in 1940, drawing the ancient god into American popular culture at a moment when superhero mythology was being invented.

  The United States Mercury dime, issued from 1916 to 1945, tells a similar story of how Mercury's image has persisted and transformed. The coin does not actually depict the god. It shows Winged Liberty, a female figure wearing a Phrygian cap rather than a winged helmet. The resemblance to Mercury's iconography was close enough to earn the coin its popular name, even though the design's intent was different.

  The United States Navy's E-6B aircraft, a communications platform, carries Mercury's name directly, a choice that ties the god of eloquence and messages to one of the military's most critical communications systems. That thread from a Roman herald's staff to a modern aircraft points to how durable the core meaning of Mercury's domain has been: the movement of words across distance, the bridging of worlds.