Hesiod's Theogony gives the allotters of fate a genealogy and a name. He calls them the Moirai, Clotho who spins the thread of a life, Lachesis who measures its length, and Atropos who cuts it, and he places them twice in his poem, first as daughters of Night born without a father, stern powers who track down every transgression by mortals and gods alike, and later as daughters of Zeus and Themis, personified Law, alongside the Horai who govern the seasons. The double genealogy is usually read as evidence that an older cult of the Moirai, powers older than Olympus, was folded incompletely into the newer order Zeus represents once his reign is filled in. Even placed among his own children, the Moirai keep the authority the earlier version implies.
Sanctuaries and altars to them existed at several Greek sites including Corinth, Sicyon, Athens and Delphi, sometimes shared with Aphrodite, Zeus Moiragetes, guide of fate, or Artemis, and they received offerings at moments a Greek family cared most about controlling and could not, birth and marriage above all, since a child's whole allotted lifespan was thought fixed at the cutting of the thread. Fifth century tragedy leans on the same idea whenever a character struggles uselessly against a foretold outcome, and later Stoic philosophy secularized it further, reading moira as a name for the causal order of nature itself rather than three goddesses with shears, a shift that let the old image of unbreakable allotment outlive the religion that first pictured it.