The Iliad does not begin with a war. It begins with a feeling. Its first word is menis — wrath — and the whole poem is the arc of one man's rage: where it comes from, what it costs, and how, at the very end, it burns down to something that can weep with its enemy. Achilles is the greatest warrior in the world, and the story Homer chooses to tell is the story of his anger.
Achilles is the half-divine champion of the Greek army, son of the sea-nymph Thetis, fated to win undying glory at the cost of a short life. When Agamemnon seizes his war-prize Briseis, Achilles withdraws from the fighting in wounded rage, and the Greeks suffer for his absence. Only the death of his companion Patroclus draws him back — now for vengeance, not honor. He kills Hector, defiles the body, and at last, faced with Hector's grieving father, relents. That relenting is where the poem ends.
It is easy to say the Iliad is "about Achilles' anger," but the poem is careful to show that his anger is not one thing. The wrath of the early books is the wrath of wounded honor. Agamemnon, forced to give up his own captive, takes Briseis from Achilles to salve his pride — a public insult, a theft of the honor a warrior lives by. Achilles' response is cold and enormous: he withdraws from the war and asks his divine mother to have Zeus turn the tide against his own comrades, so that the Greeks will learn exactly what they are without him. It is the fury of a man who has been slighted, and it is terrible.
The wrath of the later books is something else. When Patroclus dies wearing his armor, Achilles' anger stops being about honor at all. It becomes grief with nowhere to go — a black, self-consuming rage that drives him back into battle not to win but to kill the man who killed his friend, and then to go on desecrating the corpse long after the killing is done. Homer names the same word, menis, but he has quietly shown us two different fires: one that wants to be paid, and one that only wants to burn.
What makes Achilles more than a killing machine is that he is the one character who says the quiet part aloud. In Book 9, refusing the embassy that begs him to return, he tells them what his goddess-mother told him: that two fates carry him toward death. If he stays and fights at Troy, he will die young and his glory — his kleos — will never die. If he goes home, he will live a long life, and be forgotten. Every hero in the poem is living by that bargain; Achilles is the only one who holds it up and asks whether it is worth it.
Read in a Jungian light, the Iliad is the long education of that rage. Achilles begins as the shadow in its purest form — power without limit, wounded and withdrawn into itself — and the poem forces him down through loss and grief into something he could not reach any other way. He does not conquer his anger; he is broken open by it, and on the far side of that breaking he can look at Priam, the father of the man he hated most, and see his own father, and weep. The transformation is not victory. It is recognition.
The genius of the Iliad is that it takes the most warlike subject imaginable — the rage of the greatest killer in a brutal war — and uses it to say something unbearably humane about grief, mortality, and the cost of honor. The poem opens by naming Achilles' wrath and ends not with his triumph, and not with his death, but with the funeral of his enemy. To read the Iliad well is to keep one question always in view: where is Achilles' anger now, and what has it become?
Why is Achilles so angry in the Iliad?
At first, over honor: Agamemnon publicly seizes Briseis, the prize awarded to Achilles, humiliating him before the army. Later his anger changes entirely — after Patroclus is killed by Hector, wounded pride becomes grief-maddened desire for revenge.
What does menis mean?
Menis is the first word of the Iliad, usually translated "wrath" or "rage." It is not ordinary anger but a towering, almost sacred fury — the kind of word the Greeks otherwise reserved for gods. The whole poem is the arc of that wrath.
Does Achilles die in the Iliad?
No. His death is repeatedly foretold — he knows he is fated to die young at Troy — but it happens after the poem ends. The Iliad closes with the funeral of Hector, not the death of Achilles.