Pherecydes of Syros (/fəˈrɛsɨˌdiːz/; Φερεκύδης; 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.