Apollonius of Acharnae () was a heortologist and writer of ancient Greece who lived in the late 2nd century BCE.Felix Jacoby, Fragmente der griechischen Historiker 365 fr. 5 He was the author of a work on the festivals, On the Festivals (Περὶ ἑορτῶν).Harpocration, s. vv. πέανος, Πυανόψια, ΧαλκεῖαPhotios I of Constantinople, Bibliotheca s. v. ὑδροφορία
Modern scholars have a dubious opinion of some of the assertions of Apollonius that have been handed down to us -- namely that the Diasia and Meilichios were two separate and distinct festivals.
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