Letter E at Delphi

In the Temple of Apollo at Delphi was carved the following:


- "Know Thyself"
- "Nothing too Much"
- "Make a pledge and mischief is nigh"
and finally the letter "E" was carved. 


According to Plutarch: 


"They say that the famous Wise Men, also called by some "Sophists", were properly only five, Chilon, Thales, Solon, Bias, and Pittacus. But Cleobulus, tyrant of Lindos, and, later on, Periander of Corinth, men with no wisdom or virtue in them, but forcing public opinion by influence, friends, and favours, thrust themselves into the list of the wise, and disseminated through Greece maxims and sayings resembling the utterances of the five. Then the five were vexed, but did not choose to expose the imposture, or to have an open quarrel on the matter of title, and to fight it out with such powerful persons. They met here by themselves; and after discussing the matter, dedicated the letter E, which is fifth in the alphabet, and also as a number signifies five, thus making their own protest before the God, that they were five, discarding and rejecting the seventh and the sixth, as having no part or lot with themselves."


http://penelope.uchicago.edu/misctracts/plutarchE.html