Neanthes of Cyzicus (Νεάνθης ὁ Κυζικηνός) was a Greek historian of the early Hellenistic period, active in the late 4th and early 3rd centuries BCE [1]. A native of Cyzicus, he was a pupil of the philosopher Philiscus of Miletus and moved in intellectual circles blending philosophy and rhetoric [1][2].

His prolific output is preserved only in fragments. Major works included a history of Greece, the Hellenica (Ἑλληνικά); a biographical collection, On Famous Men (Περὶ ἐνδόξων ἀνδρῶν); a local history, the Cyzicene Annals (Κυζικηνὰ ἀνάλεκτα); and treatises on mythological and regional topics like Mythika (Μυθικά) and Priestesses of Argos (Ἀργολικαὶ ἱέρειαι) [1][2].

Neanthes is a significant fragmentary source for early Hellenistic historiography and biography. Cited by authors like Athenaeus and Diogenes Laërtius, his works provided details on philosophers, poets, and local cults [1][2]. Though Dionysius of Halicarnassus questioned his reliability, his fragments remain important for reconstructing intellectual and regional history [1].

Sources 1. Oxford Research Encyclopedia of Classics: Neanthes of Cyzicus: https://oxfordre.com/classics/view/10.1093/acrefore/9780199381135.001.0001/acrefore-9780199381135-e-4337 2. Perseus Digital Library, Smith's Dictionary of Greek and Roman Biography and Mythology: Neanthes: http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0104%3Aentry%3Dneanthes-bio-1