Plato 
Critias 

‘Critias, ‘ one of Plato’s late dialogues, contains the story of the mighty island kingdom Atlantis and its attempt to conquer Athens. ‘Critias’ is the second of a projected trilogy of dialogues, preceded by ‘Timaeus’ and followed by ‘Hermocrates, ‘ though the latter was possibly never written and ‘Critias’ was left incomplete.