Pausanias, Description of Greece 1.2:
Coming into the city, you can see a monument of Antiope the Amazon. Pindar says that this Antiope was abducted by Perithous and Theseus, but this is what Hegias of Troizen says: Heracles was besieging Themiscyra on the Thermodon, but found himself unable to capture the city. Antiope, however, fell in love with Theseus (he and Heracles were leading the army together), and she surrendered the place. Such is the account of Hegias. But the Athenians say that when the Amazons came, Antiope was shot by the bow of Molpadia, who was herself in turn killed by Theseus. Molpadia also has a monument among the Athenians.
ἐσελθόντων δὲ ἐς τὴν πόλιν ἐστὶν Ἀντιόπης μνῆμα Ἀμαζόνος. ταύτην τὴν Ἀντιόπην Πίνδαρος μέν φησιν ὑπὸ Πειρίθου καὶ Θησέως ἁρπασθῆναι, Τροιζηνίῳ δὲ Ἡγίᾳ τοιάδε ἐς αὐτὴν πεποίηται: Ἡρακλέα Θεμίσκυραν πολιορκοῦντα τὴν ἐπὶ Θερμώδοντι ἑλεῖν μὴ δύνασθαι, Θησέως δὲ ἐρασθεῖσαν Ἀντιόπην— στρατεῦσαι γὰρ ἅμα Ἡρακλεῖ καὶ Θησέα—παραδοῦναι τε τὸ χωρίον. τάδε μὲν Ἡγίας πεποίηκεν: Ἀθηναῖοι δέ φασιν, ἐπεί τε ἦλθον Ἀμαζόνες, Ἀντιόπην μὲν ὑπὸ Μολπαδίας τοξευθῆναι, Μολπαδίαν δὲ ἀποθανεῖν ὑπὸ Θησέως. καὶ μνῆμά ἐστι καὶ Μολπαδίας Ἀθηναίοις.