Pherecydes’ pseudepigraphic letter to Thales (Diog. Laert. I 122) is of uncertain date. It revolves around the idea that the book of Pherecydes should be interpreted allegorically. The aim of this paper is twofold: on the one hand, to contextualise the composition of the epistle through the examination of ancient witnesses who focus on Pherecydes’ obscurity; on the other hand, it shows to what extent Numenius, Celsus and Porphyry’s allegoric interpretation has misled some authoritative modern reconstruction of Pherecydes’ doctrines, as (...) it is today generally agreed that he taught the immortality of the human soul and cycle of reincarnation. (shrink)