Who is Thor?

The earliest written records of Thor come not from Scandinavians but from Romans describing Germanic peoples they encountered. Writing in the late first century, the historian Tacitus described the religious practices of the Suebi and identified their gods using Roman equivalents, a method called interpretatio romana. In this scheme, the god Odin became Mercury, the god Tyr became Mars, and Thor became Hercules, likely because Thor's hammer reminded Romans of Hercules's club. Tacitus also mentioned a sacred wood across the river Weser dedicated to this Hercules figure, understood to be Thor.

A Roman-era cult object known as Hercules Magusanus, venerated in parts of the Rhine region, has been linked by some scholars to Thor as well, on the theory that Magusanus began as a local title attached to the thunder-god before Roman observers folded him into their own Hercules.

Direct evidence of Thor worship appears gradually across the centuries following Rome's decline. The oldest surviving instance of his name is an inscription on a piece of jewelry called the Nordendorf fibula, found in Bavaria and dated to the Migration Period, which records the southern Germanic form Donar. Old English sources from the eighth century onward mention Thunor, sometimes using the name to translate Jupiter, while a ninth-century baptismal text from Mainz lists Thunaer alongside Woden and another god as pagan deities that converts to Christianity were required to formally renounce. Missionary accounts from the same era describe the felling of an oak tree sacred to Thor in the region of Hesse.

By the eleventh century, the chronicler Adam of Bremen gave a detailed account of a temple at Uppsala in Sweden, where a statue of Thor stood at the center of a triple throne alongside Odin and another god, Fricco. According to Adam, Thor was considered the mightiest of the three, ruling thunder, lightning, wind, storms, and fertility, and priests offered him sacrifices specifically in times of plague or famine. Adam also recorded that an English preacher was killed by a pagan crowd after he was seen as having insulted an image of Thor, underscoring how seriously the god's worship was still taken even as Christianity spread.

Material evidence from the Viking Age backs up these written accounts. Roughly a thousand pendants shaped like Thor's hammer have been found across Scandinavia, England, northern Germany, the Baltic region, and Russia, along with coins bearing the same symbol. Several runestones carry inscriptions invoking Thor's protection or blessing, and a handful show carved images of the god fishing for the monstrous serpent Jormungandr. Some scholars also connect the swastika symbol, found on various Germanic objects from the Migration Period through the Viking Age, to Thor's hammer or to lightning, suggesting it may have served as an alternative protective emblem.

Most of what is known about Thor's personality and adventures comes from texts written down in medieval Iceland, especially the Poetic Edda and the Prose Edda, compiled in the thirteenth century from older oral material. These sources describe Thor as the son of Odin, husband of the golden-haired Sif, and father of several children, and give him a hammer called Mjolnir, a strength-giving belt, iron gloves, and a chariot pulled by two goats that he can kill and bring back to life. One poem, the Voluspa, foretells that at the final battle of Ragnarok Thor will kill the great serpent Jormungandr but die from its venom only nine steps later.

Several poems show Thor in more human, often comic, situations. In Hymiskvida he travels to fetch a giant cauldron large enough to brew ale for all the gods, along the way catching Jormungandr on a fishing line baited with an ox head. In the satirical poem Thrymskvida, Thor's hammer is stolen by the giant Thrymr, who demands the goddess Freyja as his bride in exchange for its return. When Freyja refuses, Thor disguises himself as the bride instead, enduring the giants' wedding feast until the hammer is placed in his lap, at which point he reveals himself and kills his hosts. In the poem Alvissmal, Thor tricks a dwarf seeking to marry his daughter into talking until sunrise, at which point the dwarf turns to stone.

The Prose Edda also recasts Thor through a euhemerized lens, describing him as a prince of Troy with pale skin and hair said to be fairer than gold, later reimagined by medieval saga writers as red-bearded. In Snorri Sturluson's Heimskringla, Thor is presented as a historical pagan priest granted a dwelling by a powerful chieftain later identified with Odin, reflecting a medieval tendency to explain the old gods as exceptional humans rather than supernatural beings.

Even after Scandinavia had formally converted to Christianity, memories of Thor persisted in folklore and language. A twelfth-century runic stick found in Bergen, Norway calls on both Thor and Odin for help, long after official conversion. Folk traditions surrounding the Christian king Olaf II of Norway absorbed traits once associated with Thor, including fierce temper and a reputation as a slayer of giants and trolls. Scandinavian languages kept indirect references to the god alive through words for thunder and lightning, and place names across Scandinavia, England, and Germany still preserve his name in various forms.

In the modern era, Thor's name was given to the chemical element thorium by the Swedish chemist Jons Jacob Berzelius, and later to a United States missile program. His clearest afterlife, however, has been in popular culture: since 1962, Marvel Comics has published a superhero version of Thor created by Stan Lee, Larry Lieber, and Jack Kirby, later portrayed on screen by Chris Hemsworth in the Marvel Cinematic Universe. Thor has also appeared in novels by Neil Gaiman and Rick Riordan, in the Netflix series Ragnarok, and in video games including Age of Mythology, God of War Ragnarok, and Smite, carrying his ancient association with strength and storms into entirely new forms.