Augustine of Hippo

And no one has been so illiterate as to think that similar fables of Aesop, related for the same purpose, ought to be called lies. But also in the sacred writings such passages are found, as in the book of Judges the trees look for a king to rule over them and speak to the olive and the fig and the vine and the bramble. Surely, all this is invented in order that we may reach the matter intended by means of a narrative [that is] fictitious, to be sure, but bearing a true and not a false signification.