Passage 10.36.3
ἡ δὲ Ἄμβροσσος κεῖται μὲν ὑπὸ τὸ ὄρος τὸν Παρνασσόν, τὰ ἐπέκεινα δὲ ἢ Δελφοί· τεθῆναι δὲ τὸ ὄνομα τῇ πόλει ἀπὸ ἥρωός φασιν Ἀμβρόσσου. Θηβαῖοι δὲ ἐς τὸν Μακεδόνων καὶ Φιλίππου καθιστάμενοι πόλεμον περιέβαλον τῇ Ἀμβρόσσῳ διπλοῦν τεῖχος· τὸ δέ ἐστιν ἐπιχωρίου λίθου, χρόαν μέλανος, ἐς τὰ μάλιστα ἰσχυροῦ· κύκλος δὲ ἑκάτερος τοῦ τείχους πλάτος μὲν ἀποδέων ὀλίγον ἐστὶν ὀργυιᾶς, τὸ δὲ ὕψος ἐς ἡμίσειάν τε καὶ δύο ὀργυιάς, ὅπου μὴ τὸ τεῖχος πεπόνηκε·
Ambrossos lies at the foot of Mount Parnassus, beyond Delphi. They say the city received its name from the hero Ambrossos. When the Thebans were preparing for their war against Philip and the Macedonians, they surrounded Ambrossos with a double wall. This wall is made of a native stone, black in color and exceedingly strong; each circuit of the wall is just under a fathom wide, with a height of two and a half fathoms, except in places where the wall has suffered damage.