Passage 2.29.3
τὸ δὲ ὄνομα προϋπῆρχεν ἤδη τῇ χώρᾳ, Φώκου τοῦ Ὀρνυτίωνος γενεᾷ πρότερον ἐς αὐτὴν ἐλθόντος. ἐπὶ μὲν δὴ Φώκου τούτου ἡ περὶ Τιθορέαν τε καὶ Παρνασσὸν ἐκαλεῖτο ἡ Φωκίς· ἐπὶ δὲ τοῦ Αἰακοῦ καὶ πᾶσιν ἐξενίκησεν, ὅσοι Μινύαις τέ εἰσιν Ὀρχομενίοις ὅμοροι καὶ ἐπὶ Σκάρφειαν τὴν Λοκρῶν καθήκουσι.
The name already belonged to the country before that time, as Phocus, son of Ornytion, had come there at an earlier period. During this Phocus' lifetime, the territory around Tithorea and Parnassus was called Phocis. But in the time of Aeacus, it conquered all the neighboring peoples bordering the Orchomenians of Minyean descent and extending as far as the Locrian city of Scarphia.