To this allegorical school the tale of the fight around the walls of Troy was a mystery, behind which, as behind a veil, were hidden certain moral and physical truths. The contest between Athena and Ares was that eternal contest between rational thought and the brute force of ignorance; the arrows which rattled in the quiver of the 'Far Darter' were no longer the instruments of vengeance shot from the golden bow of the child of God, but the common rays of the sun, which was itself nothing but a mere inert mass of burning metal.
Modern investigation, with the ruthlessness of Philistine analysis, has ultimately brought Helen of Troy down to a symbol of the dawn. There were Philistines among the Greeks also who saw in the [Greek text which cannot be reproduced] a mere metaphor for atmospheric power.
Now while this tendency to look for metaphors and hidden meanings must be ranked as one of the germs of historical criticism, yet it was essentially unscientific. Its inherent weakness is clearly pointed out by Plato, who showed that while this theory will no doubt explain many of the current legends, yet, if it is to be appealed to at all, it must be as a universal principle; a position he is by no means prepared to admit.
Like many other great principles it suffered from its disciples, and furnished its own refutation when the web of Penelope was analysed into a metaphor of the rules of formal logic, the warp representing the premises, and the woof the conclusion.
Rejecting, then, the allegorical interpretation of the sacred writings as an essentially dangerous method, proving either too much or too little, Plato himself returns to the earlier mode of attack, and re-writes history with a didactic purpose, laying down certain ethical canons of historical criticism. God is good; God is just; God is true; God is without the common passions of men. These are the tests to which we are to bring the stories of the Greek religion.
'God predestines no men to ruin, nor sends destruction on innocent cities; He never walks the earth in strange disguise, nor has to mourn for the death of any well-beloved son. Away with the tears for Sarpedon, the lying dream sent to Agamemnon, and the story of the broken covenant!' (Plato, REPUBLIC, Book ii. 380; iii. 388, 391.)
Similar ethical canons are applied to the accounts of the heroes of the days of old, and by the same A PRIORI principles Achilles is rescued from the charges of avarice and insolence in a passage which may be recited as the earliest instance of that 'whitewashing of great men,' as it has been called, which is so popular in our own day, when Catiline and Clodius are represented as honest and far-seeing politicians, when EINE EDLE UND GUTE NATUR is claimed for Tiberius, and Nero is rescued from his heritage of infamy as an accomplished DILETTANTE whose moral aberrations are more than excused by his exquisite artistic sense and charming tenor voice.
But besides the allegorising principle of interpretation, and the ethical reconstruction of history, there was a third theory, which may be called the semi-historical, and which goes by the name of Euhemeros, though he was by no means the first to propound it.