Greek and Norse gods compared: which pairs hold up

The short answer

No ancient source matches Greek gods to Norse gods directly. The earliest matches run through Rome: Roman writers gave Germanic gods Roman names, and the Roman names have standard Greek counterparts. On that route three pairs rest on early evidence, Hermes and Odin, Zeus and Thor, and Ares and Týr.

Eleven pairs are compared on this page. Three are marked Attested, three Scholarly and five Popular claim, which means that none of the reference pages read for this article makes the comparison. Hades and Hel, Poseidon and Njord, Hera and Frigg, Apollo and Baldr, and Hermes and Loki are in that last group.

The route through Rome

The Norse sources are late. The Odin entry dates the Poetic Edda and the Prose Edda to the 13th century, while Tacitus wrote the Germania around AD 98. More than a thousand years separate the first Roman comparison from the main Norse texts, and the Roman comparison describes Germanic peoples such as the Suebi, not Icelandic poets.

The entry on interpretatio germanica adds a caution. It reports that Rudolf Simek emphasizes the paucity of evidence for a widespread interpretatio germanica, compared with the well-attested Roman practice, and that comparison with Roman gods is insufficient to reconstruct ancient Germanic gods or to equate them definitively with later Norse mythology. The entry itself carries a notice that it needs additional citations.

Weekday names are the other route. According to that page, Tuesday replaced Mars with Tīwaz (Týr), Wednesday replaced Mercury with Wōdanaz (Odin), Thursday replaced Jupiter with Þunraz (Thor), and Friday replaced Venus with Frijjō (Frigg). Saturday has no Germanic substitute. The Roman names in that list have the Greek counterparts Ares, Hermes, Zeus and Aphrodite, as the page on Greek and Roman gods sets out.

The pair table

Each row gives the Greek god, the Norse god, a strength mark and what the reference pages record. The marks are explained near the end of the article.

Where the pairs hold and where they fail

Hermes and Odin

Tacitus calls Odin Mercury, and the Hermes page lists what the two share. Both carry a staff and wear a wide-brimmed hat, both are travelers, Mercury guides the dead and Odin rules them in Valhalla, and both are credited with eloquent speech and secret knowledge. The Odin entry adds that Anthony Birley links the Mercury label to Mercury's role as psychopomp, the guide of souls, and not to his role as messenger.

Odin is also widely regarded as a god of the dead and warfare. He sacrificed one eye for wisdom and he receives the slain warriors in Valhöll, the Hall of the Slain. The Roman match was not exclusive. Adam of Bremen says Odin is depicted in armor as his own people depict Mars, and a disputed inscription on the Ring of Pietroassa may read Wodan-Jove. The Odin entry also says Jan de Vries compared Odin to Hermes directly.

Zeus, Thor and Týr

Zeus is the supreme deity of the Greek pantheon, a sky and thunder god who rules as king of the gods on Mount Olympus. Thor is described as a hammer-wielding god of thunder, storms and strength who also has a place in protection, fertility and farming, and he is the son of Odin and Jörð. Roman writers equated Thor with Jupiter or Hercules. Tacitus names Hercules as the god of the Suebi, and the identification with Hercules is likely at least in part due to similarities between Thor's hammer and Hercules' club. Adam of Bremen writes that Thor, with his mace, looks like Jupiter.

The name Týr points somewhere else. The word traces to Proto-Indo-European *deywós, meaning celestial or heavenly one, which it connects to *dyēus and to Zeus. The Zeus entry calls Zeus the Greek continuation of *Dyēus, the name of the Proto-Indo-European god of the daytime sky, though it does not mention Týr. Some scholars read Tīwaz as a sky, war and legal-assembly god. Others reject the sky-god label, and the page quotes West as saying he does not seem to be the old sky god. Reichert suggests that Odin may have dislodged Týr from a pre-eminent position, and the page treats that as a hypothesis.

Ares and Týr

Latin sources equate Týr with Mars. The Housesteads altar, dated to the 3rd century CE, is dedicated to Deo Marti Thincso, which the Týr page reads as referring to him, and Tuesday derives from Latin Martis dies. Týr is tied to the thing, the Germanic legal assembly. Gylfaginning says he has great power over victory in battles and is now considered a promoter of settlements between people, and Skáldskaparmál calls him a battle-god. Britannica says Ares was never very popular in Greece and describes him as the unpleasant side of war, the brutal violence and killing.

Týr's best-known myth has him place his hand in the mouth of the wolf Fenrir as a pledge while the gods bind it. The gods refuse to release the wolf, and it bites off the hand. He is foretold to die at Ragnarök fighting the dog Garmr, each killing the other.

Aphrodite, Freyja and Frigg

Britannica says Freyja was in charge of love, fertility, battle and death. It was her privilege to choose one-half of the heroes slain in battle for her hall in the Fólkvangar, and Odin took the other half to Valhalla. Britannica compares her with Aphrodite on one point: like Isis and Aphrodite, Freyja traveled through the world seeking a lost husband. The Aphrodite entry does not mention Freyja. It describes Aphrodite as an ancient Greek goddess of love, lust, beauty, pleasure, passion and procreation, and says the derivation of her name cannot be determined with confidence.

Frigg is the other candidate. The entry on interpretatio germanica has Frijjō replacing Venus in the weekday names, and the Frigg page says Friday is a calque of Latin Veneris dies. The Frigg entry does not itself equate her with Venus. It describes her as the wife of Odin and says she has roles in marriage, prophecy, clairvoyance and motherhood. It also notes that some scholars propose Frigg and Freyja descend from a common entity, a question the scholar Stephan Grundy calls a difficult one. On the Greek side, the Aphrodite page says the Romans identified Aphrodite with Venus, officially in the third century BC. The chain from Aphrodite to Venus to Frigg exists, but it rests on weekday names.

Five pairs that the pages do not support

Hera and Frigg. Hera is the goddess of marriage, women and family, queen among the twelve Olympians, and the sister and wife of Zeus. Frigg is the wife of Odin and the mother of Baldr. Both are the chief god's wife, and neither the Hera page nor the Frigg page mentions the other.

Hades and Hel. Hades is the god of the dead and riches and king of the underworld, and the page says all mortals go to his realm and very few leave it. Hel is a female being who presides over a realm of the same name and receives a portion of the dead. Gylfaginning has her receive those who die of sickness or old age, and names her a daughter of Loki and Angrboða whom Odin cast into Niflheim. The Hel entry compares her with Saxo's Proserpina, with Kali and with the Irish Morrígan and Badb, among others, but not with Hades.

Poseidon and Njord. Poseidon presides over the sea, storms, earthquakes and horses, and carries the trident. Britannica describes Njord as the god of the wind and of the sea and its riches, invoked in seafaring and in hunting and considered a giver of wealth. He came from the Vanir as a hostage to the Æsir and fathered Freyr and Freyja by his sister. The sea is the only shared domain, and neither page names the other god.

Apollo and Baldr. Apollo's functions are light, healing, prophecy, music, poetry and archery, and his arrows could also bring plague. Gylfaginning calls Baldr the wisest of the Æsir and says light shines from him. Loki gives the blind Höðr a spear made of mistletoe, and Höðr kills Baldr with it. Baldr stays in Hel until after Ragnarök. Brightness is what the two share, and neither page mentions the other.

Hermes and Loki. Hermes is the divine trickster, and the Homeric Hymn tells how he stole Apollo's cattle and invented the lyre. Some have described Loki as a trickster god and Jan de Vries theorized he is a typical trickster figure. Loki is a shape-shifter, the son of the jötunn Fárbauti and the goddess Laufey, and he is foretold to break free and fight the gods at Ragnarök. The trickster label is shared, and neither page mentions the other.

What the strength marks mean

Attested means a named early writer or an inscription equates the Norse god with a Roman god: Tacitus and Adam of Bremen for Odin and Thor, and the Housesteads altar for Týr. The step from the Roman god to the Greek one is the identification covered on the Greek and Roman gods page.

Scholarly means a reference page makes the comparison without an early source. That covers the shared root of Týr and Zeus, Britannica on Freyja and Aphrodite, and the weekday names for Frigg and Venus. Popular claim means none of the pages read for this article makes the comparison, and the pair is listed to show that the pages do not support it.

The reference pages are secondary sources. Britannica's Freyja page cites no primary sources in its text, and the page on interpretatio germanica carries a notice that it needs additional citations. The Eddas, Tacitus and Adam of Bremen were read only through the pages cited here. Britannica pages for Odin, Thor, Týr, Hel and Loki were not read for this article, so Wikipedia is the source for those gods.