Thesprotians Greek, and that throughout the region bilingualism in West Greek and Illyrian was predominant. Hernandez (2018) finally concludes, however, that Cabanes' theory is unlikely and that the Chaonians spoke West Greek, the same dialect used elsewhere in Epirus as well in Akarnania. Additionally the notion of any ethnic and lingual division inside Epirus was unlikely. Pseudo-Scylax describing the geographical and ethnographical situation (c. 380-360 BC), distinguished the Illyrians from the Chaonians, making it clear that the Chaonians did not speak Illyrian. Religion The sanctuary of Dodona was a religious site frequented by all the Epirote peoples, including the Chaonians. Chaonians constructed their own treasury, likely as a way to highlight their participation and to enhance their identity. The region of Chaonia appears as a place visited by the theoroi, in an Epidaurian list of theorodokoi. Theoroi were sent by the major Panhellenic sanctuaries throughout the Greek world, and theorodokoi's duty was to host and assist the former in preparation of the Panhellenic games and festivals. The list was compiled in 360 or 356 BC. The worship of many Greek gods is attested in Chaonia; these include Athena, Artemis, Asclepius, Zeus, Pan and Poseidon. In particular, at Bouthrotos, the worship of Athena, Asclepius and Zeus Soter is attested; the combined worship of the three, is associated with coastal areas and may have been part of a common cult that is also attested in other parts of the Greek world. Zeus, the central figure of the Greek Pantheon, was a popular deity among the Chaonians, as well as the rest of northern Greece. Zeus Chaonius, was also associated with the Acroceraunian mountains. In Bouthrotos, he was one of the main deities with the epithet "Soter" (Zeus Soter 'Zeus the Saviour'); the epithet "Soter" is associated with the protection of sailors. In the same city, Zeus was also invoked with the epithet "Kassios". Heracles – who was a son of Zeus – was another deity that was worshipped in Bouthrotos. The worship of Poseidon was popular in the region and Taurian Poseidon () is associated with chthonic features, being protector of the sherpents and the flocks. This kind of worship was quite archaic in the region and was preserved from prehistoric Mycenaean Greece (1600-1100 B.C). A temple dedicated to Athena Polias was erected in Chaonian territory, which is attested from an oracular lamella from Dodona dated to ca. 330–320 BC. The inscription