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. Appealing to a fictitious monument which he declared that he had discovered in the island of Panchaia, and which purported to be a column erected by Zeus, and detailing the incidents of his reign on earth, this shallow thinker attempted to show that the gods and heroes of ancient Greece were ‘mere ordinary mortals, whose achievements had been a good deal exaggerated and misrepresented,’ and that the proper canon of historical criticism as regards the treatment of myths was to rationalise the incredible, and to present the plausible residuum as actual truth. To him and his school, the centaurs, for instance, those mythical sons of the storm, strange links between the lives of men and animals, were merely some youths from the village of Nephele in Thessaly, distinguished for their sporting tastes; the ‘living harvest of panoplied knights,’ which sprang so mystically from the dragon’s teeth, a body of mercenary troops supported by the profits on a successful speculation in ivory; and Actæon, an ordinary master of hounds, who, living before the days of subscription, was eaten out of house and home by the expenses of his kennel. Now, that under the glamour of myth and legend some substratum of historical fact may lie, is a proposition rendered extremely probable by the modern investigations into the workings of the mythopœic spirit in post-Christian times. Charlemagne and Roland, St. Francis and William Tell, are none the less real personages because their histories are filled with much that is fictitious and incredible, but in all cases what is essentially necessary is some external corroboration, such as is afforded by the mention of Roland and Roncesvalles in the chronicles of England, or (in the sphere of Greek legend) by the excavations of Hissarlik. But to rob a mythical narrative of its kernel of supernatural elements, and to present the dry husk thus obtained as historical fact, is, as has been well said, to mistake entirely the true method of investigation and to identify plausibility with truth.