The Cassopaei () were an ancient Greek tribe living in ancient Epirus and occupying the coast between Thesprotia and the Ambracian Gulf, and bordering upon Nicopolis. Their chief town was Cassope (Κασσώπη). The Periplus of Pseudo-Scylax describes the Cassopaei as living in villages;Periplus of Pseudo-Scylax, p. 12 but they afterwards rose to such power as to obtain possession of Pandosia, Buchaetium, and Elateia.Demosthenes, On Halonnesus 33. We learn from another authority that Batiae was also in their territory.Theopompus ap. Harpocr. s.v. Ἐλάτεια
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