Passage 1.28.3
τῇ δὲ ἀκροπόλει, πλὴν ὅσον Κίμων ᾠκοδόμησεν αὐτῆς ὁ Μιλτιάδου, περιβαλεῖν τὸ λοιπὸν λέγεται τοῦ τείχους Πελασγοὺς οἰκήσαντάς ποτε ὑπὸ τὴν ἀκρόπολιν· φασὶ γὰρ Ἀγρόλαν καὶ Ὑπέρβιον τοὺς οἰκοδομήσαντας εἶναι . πυνθανόμενος δὲ οἵτινες ἦσαν οὐδὲν ἄλλο ἐδυνάμην μαθεῖν ἢ Σικελοὺς τὸ ἐξ ἀρχῆς ὄντας ἐς Ἀκαρνανίαν μετοικῆσαι.
It is said that the Pelasgians, who once inhabited under the Acropolis, built the wall around it, except the portions constructed later by Cimon the son of Miltiades. They also say that Agrolas and Hyperbius were its builders. When I inquired who these men were, I was able to gather nothing else except that they were originally Sicilians who migrated to Acarnania.