Homines in lupos verti rursusque restitui sibi falsum esse confidenter existimare debemus aut credere omnia quae fabulosa tot saeculis comperimus; unde tamen ista vulgo infixa sit fama in tantum ut in maledictis versipelles habeat indicabitur. Euanthes, inter auctores Graeciae non spretus, scribit Arcadas tradere ex gente Anthi cuiusdam sorte familiae lectum ad stagnum quoddam regionis eius duci vestituque in quercu suspenso tranare atque abire in deserta transfigurarique in lupum et cum ceteris eiusdem generis congregari per annos novem; quo in tempore si homine se abstinuerit, reverti ad idem stagnum et, cum tranaverit, effigiem recipere, ad pristinum habitum addito novem annorum senio, addit quoque fabulosius eandem recipere vestem! mirum est quo procedat Graeca credulitas: nullum tam impudens mendacium est ut teste careat. item Apollas, qui Olympionicas scripsit, narrat Demaenetum Parrhasium in sacrificio, quod Arcades Iovi Lycaeo humana etiamtum hostia faciebant, immolati pueri exta degustasse et in lupum se convertisse, eundem decimo anno restitutum athletice se exercuisse in pugilatu victoremque Olympia reversum. quin et caudae huius animalis creditur vulgo inesse amatorium virus exiguo in villo eumque cum capiatur abici nec idem pollere nisi viventi direptum.
(Pliny the Elder, Nat. Hist. 8.80-83)
We are bound to pronounce with confidence that the story of men being turned into wolves and restored to themselves again is false—or else we must believe all the tales that the experience of so many centuries has taught us to be fabulous; nevertheless we will indicate the origin of the popular belief, which is so firmly rooted that it classes werewolves among persons under a curse. Evanthes, who holds no contemptible position among the authors of Greece, writes that the Arcadians have a tradition that someone chosen out of the clan of a certain Anthus by casting lots among the family is taken to a certain marsh in that region, and hanging his clothes on an oak-tree swims across the water and goes away into a desolate place and is transformed into a wolf and herds with the others of the same kind for nine years; and that if in that period he has refrained from touching a human being, he returns to the same marsh, swims across it and recovers his shape, with nine years’ age added to his former appearance; Evanthes also adds the more fabulous detail that he gets back the same clothes. It is astounding to what lengths Greek credulity will go; there is no lie so shameless as to lack a supporter. Similarly Apollas the author of Olympic Victors relates that at the sacrifice which even at that date the Arcadians used to perform in honour of Lycaean Jove with a human victim, Daemenetus of Parrhasia tasted the vitals of a boy who had been offered as a victim ad turned himself into a wolf, and furthermore that he was restored then years later and trained himself in athletics for boxing and returned a winner from Olympia. Moreover it is popularly believed that even the tail of this animal contains a love-poison in a small tuft of hair, and when it is caught it sheds the tuft, which has not the same potency unless plucked from the animal while it is alive. (tr. Harris Rackham)