Passage 10.8.1
καταστήσασθαι δὲ συνέδριον ἐνταῦθα Ἑλλήνων οἱ μὲν Ἀμφικτύονα τὸν Δευκαλίωνος νομίζουσι καὶ ἀπὸ τούτου τοῖς συνελθοῦσιν ἐπίκλησιν Ἀμφικτύονας γενέσθαι, Ἀνδροτίων δὲ ἐν τῇ Ἀτθίδι ἔφη συγγραφῇ ὡς τὸ ἐξ ἀρχῆς ἀφίκοντο ἐς Δελφοὺς παρὰ τῶν προσοικούντων συνεδρεύοντες, καὶ ὀνομασθῆναι μὲν Ἀμφικτίονας τοὺς συνελθόντας, ἐκνικῆσαι δὲ ἀνὰ χρόνον τὸ νῦν σφισιν ὄνομα.
Concerning the establishment of the assembly of Greeks here, some believe that Amphictyon, the son of Deucalion, instituted it, and from him those who assembled took the name Amphictyons. Androtion, however, in his work on Athenian history, stated that from the very beginning delegates came together at Delphi from the neighboring peoples, and though those who gathered were first called Amphictions, in the course of time their present name came to prevail.