mõjukamaid filosoofe.Platoni õpetus puudutas praktiliselt kõiki filosoofia valdkondi.Platonile on omistatud 36 dialoogi ja 13 kirja. Mitme teose autorsuses on siiski kaheldud. Platon pärines Ateena aristokraatiast. Tema sünninimi oli Aristokles ta vanaisa järgi. Platon ("lai") on hüüdnimi, mille ta pälvis maadlustreenerilt oletatavasti ka laia lauba või laiade õlgade pärast. Diogenes Laertiose andmeil, milles on küll kaheldud, põlvnes Platoni isa Ariston Ateena kuningast Kodrosest,ema Periktione aga seadusandjast Solonist. Periktione oli kolmekümne türanni reziimi ajal mõjuvõimsa Kritiase nõbu. Nooruses sai Platon korraliku hariduse grammatikas, muusikas ja gümnastikas. Enne Sokratesega kohtumist oli ta õppinud filosoofiat Herakleitose õpilase Kratylose juures.Platoni ja Sokratese täpne vahekord on tekitanud vaidlusi, kuna Platoni säilinud dialoogid ei anna sellest kuigi selget pilti. Platon
Are quick to anger, vengeful, faithless, tricky, And, to destroy a man, will have the boldness To call their private grudge the cause of heaven; All the more dangerous, since in their anger They use against us weapons men revere, And since they make the world applaud their passion, And seek to stab us with a sacred sword. There are too many of this canting kind. Still, the sincere are easy to distinguish; And many splendid patterns may be found, In our own time, before our very eyes Look at Ariston, Periandre, Oronte, Alcidamas, Clitandre, and Polydore; No one denies their claim to true religion; Yet they're no braggadocios of virtue, They do not make insufferable display, And their religion's human, tractable; They are not always judging all our actions, They'd think such judgment savoured of presumption; And, leaving pride of words to other men, 'Tis by their deeds alone they censure ours. Evil appearances find little credit With them; they even incline to think the best Of others
light. Several stories in the Histories of Herodotus deal specifically with methods of steganography (not cryptography). The Father of History tells how one of the most important messages in the history of Western civilization was transmitted secretly. It gave to the Greeks the crucial information that Persia was planning to conquer them. According to Herodotus, The way they received the news was very remark-bale. Demaratus, the son of Ariston, who was an exile in Persia, was not, I imagine—and as is only natural to suppose—well disposed toward the Spartans; so it is open to question whether what he did was inspired by benevolence or malicious pleasure. Anyway, as soon as news reached him at Susa that Xerxes had decided upon the invasion of Greece, he felt that he must pass on the information to Sparta. As the danger of discovery was great, there
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