Atlantis was Plato's invented cautionary tale, not a lost real place
Classicists agree that Plato made up Atlantis as an allegory of national arrogance: a mighty western sea empire that attacked Europe, lost to ancient Athens and sank in a single day and night. Nineteenth-century amateurs mistook it for history, launching a hunt that has never found anything.
Every account of Atlantis traces back to two dialogues by Plato, the Timaeus and the Critias, written around 360 BC. They claim the story came from Solon, who supposedly heard it from Egyptian records during a visit between 590 and 580 BC. Of the four speakers, Socrates, Timaeus of Locri, Critias and Hermocrates, only Critias talks about the island. The frame matters: Socrates has just been musing about the ideal society of the Republic, and Critias offers a tale that shows such a state in action.
In Critias's telling, the gods divided the world and Poseidon received Atlantis, an island bigger than Libya and Asia Minor together. He fell for Cleito, who bore him five pairs of twin sons; the eldest, Atlas, became king of the island and gave his name to the Atlantic. Poseidon ringed Cleito's mountain home with three circular moats, and the Atlanteans later bridged them and cut a great canal to the sea.
Nine thousand years before Critias, the story goes, the Atlanteans pushed through the Pillars of Hercules at Gibraltar, conquering Libya as far as Egypt and Europe as far as Tyrrhenia, until Athens stood against them. Then earthquakes and floods struck, and the island vanished beneath the sea, leaving an impassable shoal of mud. Plato deliberately set this western naval power against his idealised Athens.
Why it endures is its own story. Renaissance writers borrowed the allegory for utopias, including Francis Bacon's New Atlantis and Thomas More's Utopia. Scholars still debate what inspired Plato, since he freely adapted older tales, as he did with the story of Gyges. An earlier work titled Atlantis by Hellanicus of Lesbos survives only in fragments and seems to have been a genealogy of Atlas's daughters, though some have suspected a link.
Source: Atlantis
