Plutarch's letter to the priestess Clea allegorizing the Isis and Osiris myth as Greek philosophy about the struggle of reason against disorder.
De Iside et Osiride is a long essay, cast as a letter to Clea, a priestess of Isis at Delphi, in which Plutarch retells the Egyptian myth of Isis, Osiris, and Typhon (Seth) and then works through a series of philosophical, physical, astronomical, and etymological interpretations of it. He opens by arguing that the pursuit of the gods is really the pursuit of truth, and that Isis's name and cult both point to knowledge as the highest form of piety. He then narrates the myth itself: Typhon's plot to trap Osiris in a chest and drown him, Isis's search for the body, its dismemberment, and her recovery and burial of the pieces, along with the birth and eventual triumph of their son Horus over Typhon.
Having told the story, Plutarch spends the bulk of the work testing and comparing explanations of it: literal historical readings he rejects (he specifically attacks Euhemerus of Messene for reducing all gods to deified kings), natural/physical readings (Osiris as the Nile and fertile principle, Isis as the earth, Typhon as the sea or drought), astronomical and calendrical readings, and finally the interpretation he most favors, a Platonic-dualist one in which Osiris represents ordered, rational, generative power, Typhon represents disorder, passion, and destructive excess, and Isis represents the receptive material principle that loves and pursues the good and is adorned by it. Along the way he catalogs Egyptian ritual practices, taboos on foods and animals, and sacred etymologies, treating them as encoded philosophy rather than superstition.
The essay matters both as a primary source for Greco-Roman-era Egyptian religion, largely unrecoverable from Egyptian texts themselves, and as a document of Middle Platonist method: Plutarch treats foreign myth the way Greek allegorists treated Homer, assuming a rational core is hidden under strange narrative surface, and insists that dogmatic literalism about myth is itself impious. His closing pages on incense, particularly the kyphi recipe and its rationale, show the same method applied to ritual material culture.
“God gives men everything else that they need, but of mind and understanding he grants a share, since these are his own possessions and the very things he uses.”
— De Iside Et Osiride · read this chapter →
“That is why the longing for divinity is a longing for the truth, above all the truth about the gods”
— De Iside Et Osiride · read this chapter →
“giving free rein to the impostures of Euhemerus of Messene, who himself composed a fictitious record of an incredible and nonexistent mythology and has poured out atheism over the whole inhabited world”
— De Iside Et Osiride · read this chapter →
“The conspirators then rushed up and slammed the lid shut, and, some nailing it fast from outside and others pouring molten lead over it, carried it out to the river and released it into the sea through the Tanitic mouth”
— De Iside Et Osiride · read this chapter →
“the Nile is Osiris consorting with Isis, who is the earth, while Typhon is the sea, into which the Nile falls and is scattered and disappears”
— De Iside Et Osiride · read this chapter →
It is a long essay-letter to the priestess Clea explaining the Egyptian myth of Isis, Osiris, and Typhon (Seth), then offering multiple layers of philosophical, physical, and astronomical interpretation of that myth. Plutarch treats the story as an allegorical vehicle for Platonic ideas about order, matter, and divine knowledge rather than literal history.
Typhon (identified with the Egyptian god Seth) is Osiris's murderous brother who traps him in a chest, drowns him, and later dismembers his body. Plutarch reads Typhon philosophically as the principle of disorder, violent passion, and destructive excess opposed to Osiris's rational, generative order.
No. He explicitly rejects purely historical readings and attacks Euhemerus of Messene for claiming all gods were simply deified kings, calling this an atheistic imposture. Plutarch instead layers physical (Nile/earth/sea) and philosophical (order/matter/disorder) interpretations onto the story.
He opens the work arguing that true piety is the pursuit of understanding: 'of mind and understanding he grants a share, since these are his own possessions.' For Plutarch, seeking truth about the gods is itself a sacred, priestly act, not just performing rites.
He treats dietary restrictions (such as avoiding onions) and animal veneration (crocodiles, wolves, the Apis bull) as encoded philosophical or ritual symbolism rather than superstition, working out an allegorical rationale for each custom he catalogs.
Plutarch says he would concede Egyptians the name Sarapis over Osiris since Sarapis is a foreign word and Osiris a Greek one, but holds 'both to belong to one god and one power.'
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