Passage 8.23.3
τὸ δὲ ὄνομά ἐστι μὲν δῆλον ἀπὸ Κηφέως τοῦ Ἀλέου τῇ πόλει γεγονός, ὀνομάζεσθαι δὲ αὐτὴν φωνῇ τῇ Ἀρκάδων Καφυὰς ἐκνενίκηκε. φασὶ δὲ οἱ Καφυεῖς τὰ ἄνωθεν ἐκ τῆς Ἀττικῆς εἶναι χώρας, ἐκβληθέντες δὲ ὑπὸ Αἰγέως ἐξ Ἀθηνῶν ἐς Ἀρκαδίαν φυγεῖν καὶ ἱκέται γενόμενοι Κηφέως οἰκῆσαι ἐνταῦθα. τὸ μὲν δὴ πόλισμα ἐπὶ τοῦ πεδίου τῷ πέρατι ὀρῶν οὐκ ἄγαν ὑψηλῶν παρὰ τοῖς ποσίν ἐστι· Καφυάταις δὲ ἱερὰ θεῶν Ποσειδῶνός ἐστι καὶ ἐπίκλησιν Κνακαλησίας Ἀρτέμιδος.
The city evidently derived its name originally from Cepheus, the son of Aleus, yet it has come to be known, according to the Arcadian dialect, as Caphyae. The inhabitants of Caphyae say they were originally from Attic territory, but that after being driven out of Athens by Aegeus, they fled into Arcadia and, becoming suppliants of Cepheus, settled there. The town itself lies on a plain at the foot of mountains, which are not very high. The Caphyans possess sanctuaries dedicated to the gods Poseidon and Artemis called Knakalesia.