Pherecydes of Syros (; Greek: Φερεκύδης ὁ Σύριος; fl. 6th century BC) was a Greek thinker from the island of Syros. Pherecydes authored a cosmogony, derived from three divine principles, Zas (Zeus), Cthonie (Earth) and Chronos (Time), known as the "Pentemychos" (Πεντέμυχος, "of the five recesses"; sometimes the alternative title "Heptamychos", "seven recesses" is given). It formed a bridge between the mythological thought of Hesiod and pre-Socratic philosophy. His work is lost, but it survived into the Hellenistic period and we are informed on part of its content indirectly. Pherecydes was said to have been the first writer to communicate philosophical musings in prose. Aristotle regarded him partly a mythological writer and Plutarch, as well as many other writers gave him the title of Theologus.
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