The single most useful correction anyone can make when reading this material is to stop translating jötunn as "giant". Size is not what the word is about. Norse giants are frequently the same size as gods, marry them, sleep with them, exchange treasures with them and are related to them by blood; Odin himself is three-quarters giant by descent and Thor's mother is one. What separates the two groups is not stature but allegiance — an ás belongs to the in-group, a jötunn does not. English handed the whole category to a word about height, and the misunderstanding has been compounding ever since.
The pattern: gods defeat a previous order
Where the comparison genuinely works, it works like this. In several traditions the current gods are not the first powers. They came to authority by defeating an older generation, and that older generation is remembered as vast, elemental, and closer to the raw material of the world than to its administration.
- The Greek Titans precede the Olympians, are defeated by them after a ten-year war, and are confined in Tartarus. They are not monsters. They include the mother of the gods, the bearer of the sky, and the giver of fire to humankind.
- The Norse jötnar precede the Æsir and supply the raw material: the world is built from the body of Ymir, which means the cosmos is literally made of the enemy.
- The Irish Fomorians are the power the Tuatha Dé Danann displace, and here the family relationship is explicit — the god-king who kills the Fomorian champion is that champion's grandson.
- Babylonian material follows the same shape without any giants at all: Marduk defeats Tiamat, an older and more elemental power, and builds the world from her.
The recurrence is real, and it does not require a shared prehistoric source to explain. A pantheon that wants to justify its authority needs a story about how it acquired it, and the most economical such story is a war against predecessors. Structurally this is the mythological equivalent of a founding charter.
Where the lumping fails
Four members of the usual list do not fit, and pretending otherwise is how comparative mythology gets a bad name.
The Greek Gigantes are not the Titans. They are a separate group, born of the earth, who attack Olympus later and are defeated with the help of a mortal — Heracles — because a prophecy required one. Greek writers kept the two conflicts distinct; the confusion is Roman-era and then modern. The word "giant" descends from Gigas, which is precisely why English speakers merge them.
Japanese oni are not a defeated elder generation. They are demons of a largely medieval and Buddhist-inflected imagination — horned, club-carrying, associated with hell and with the unlucky northeast direction — and they belong to the era of hundred-tales collections and temple painting, not to the chronicle account of the world's making. There is no Japanese war-against-the-titans. Slotting oni into the pattern is category error dressed as comparison.
Humbaba is a guardian, not a predecessor. He is appointed by a god to protect the cedar forest and is killed by two men who have no divine authorisation and who know it — the epic's own text treats the killing as a transgression with consequences. He is a fearsome employee, not an old power.
Biblical Nephilim are a different thing again, occupying three ambiguous verses whose meaning was already disputed in antiquity and elaborated much later in extra-canonical literature. Placing them in a line with Titans and jötnar imports several centuries of interpretive tradition as though it were the text.
What the giants are actually for
Read functionally rather than genealogically, the elder powers do three distinct jobs.
They are the material. Norse cosmology is unusually blunt about this: sky, sea, mountains and clouds are parts of a body. The world is not made against the giants; it is made of them, which gives the ongoing conflict a strange quality, since the gods live inside their enemy.
They are the outside. Jötunheim is a direction — east, and out — and much of Thor's activity is boundary maintenance. The giants are what the inhabited world is defined against, which is why their attacks are usually attempts to take something across the line: a goddess, the sun, a hammer.
They are the possessors of what the gods need. This is the most consistently overlooked feature. The mead of poetry is in giant hands. Skadi is a giantess who joins the gods; Gerdr is a giantess whom a god must have; the cauldron for brewing the gods' ale must be fetched from a giant. Wisdom is repeatedly located outside — the head at Mímir's well, the contest of knowledge with Vafthrúdnir. A tradition that put all its wisdom in the possession of the enemy was making a point.
The Greek arrangement is different again, and the difference matters. Greek Titans do not hold the goods; they hold the past. Prometheus, Atlas and the rest are of the older order and are punished, employed or absorbed, and Greek myth's interest is in succession — a father overthrown by a son, twice, with a third overthrow prophesied and averted. That is a dynastic anxiety, not a boundary anxiety.
Big people are not the same as elder powers
There is a separate and much duller category worth keeping distinct: local landscape giants. Every European country has stories in which a hill is a giant's grave, a boulder is a giant's throw and a causeway is a giant's road. These are almost entirely post-medieval folk explanations for prominent features, some of them attached to monuments thousands of years older than the tellers — the Irish material around Fionn mac Cumhaill is the best-known case, and Fionn is not a giant in the medieval literature at all, only in the later folklore. Reading the folk giants as survivals of ancient religion is exactly the nineteenth-century move the discipline has spent a century unlearning.
Continuing threads
The elder-power question overlaps with dragons and serpents, since Tiamat sits in both arguments, and with the monstrous feminine where the defeated older power is female. For the succession quarrels themselves, see Cronus, Uranus, Gaia and the Greek family tree; for the Norse arrangement, Ymir, Surtr, Thrym and Útgarða-Loki.
Questions people bring to this material
If giants are the same size as gods, why are they called giants? Because translators of the eighteenth and nineteenth centuries needed an English word and reached for the one that already existed, which had come down from the Greek Gigantes through Latin. Some jötnar genuinely are enormous — the hall in one famous journey is so large the travellers sleep in a glove — but the corpus also gives us giantesses who become goddesses, which size alone cannot accommodate.
Are the Titans evil? Not in any Greek source. They are the previous administration. Several are treated with respect, one is honoured as humanity's benefactor, and the Roman-era tradition even has their leader ruling a golden age in exile — which is why the December festival of the Roman god identified with him was a holiday rather than a warding-off.
Why does the elder-generation war keep recurring? Partly because it is politically useful — every ruling group needs an account of why it rules — and partly because Indo-European traditions may have inherited a version of it. But it also appears where inheritance cannot explain it, as in Babylon, so the safe answer is that it is a widely reinvented solution to a common problem rather than a single ancestral story.
Was there ever a real memory of earlier peoples behind these stories? This was once popular — the Fomorians as a pre-Celtic population, for instance — and it has been abandoned. The medieval Irish material is Christian pseudo-history constructed to fit invading-peoples into a biblical chronology, not ethnographic memory, and no archaeological evidence supports the reading.