Atlantis (Ancient Greek: ... Atlantis nesos, "island of Atlas") is a fictional island mentioned in an allegory on the hubris of nations in Plato's works Timaeus and Critias, wherein it represents the antagonist naval power that besieges "Ancient Athens", the pseudo-historic embodiment of Plato's ideal state in The Republic.

Atlantis - [en.wikipedia.org]

Timaeus - Atlantis[en.wikipedia.org]) - [www.yorku.ca] ; [classics.mit.edu]

Critias - [en.wikipedia.org]) - [www.gutenberg.org]