Passage 3.1.7
ὀνόματα μὲν δὴ τοῖς παισὶν αὐτοῦ Προκλῆς καὶ Εὐρυσθένης ἐτέθη, δίδυμοι δὲ ὄντες διάφοροι τὰ μάλιστα ἦσαν. προεληλυθότες δὲ ἐπὶ μέγα ἀπεχθείας ὅμως ἐν κοινῷ Θήρᾳ τῷ Αὐτεσίωνος, ἀδελφῷ τῆς μητρὸς σφῶν ὄντι Ἀργείας, ἐπιτροπεύσαντι δὲ καὶ αὐτῶν, συνήραντο ἐς ἀποικίαν. τὴν δὲ ἀποικίαν ὁ Θήρας ἔστελλεν ἐς τὴν νῆσον τὴν τότε ὀνομαζομένην Καλλίστην, τοὺς ἀπογόνους οἱ τοῦ Μεμβλιάρου παραχωρήσεσθαι τῆς βασιλείας ἐλπίζων ἑκόντας, ὅπερ οὖν καὶ ἐποίησαν
His sons were named Procles and Eurysthenes, who were twins but exceedingly different in character. Though they had fallen into great mutual enmity, they nonetheless came together in undertaking a colony under the leadership of Theras, son of Autesion. Theras himself was their guardian, being the brother of their Argive mother. Theras dispatched the colony to the island then called Calliste, anticipating that the descendants of Membliarus would voluntarily yield the royal rule to him—which indeed they did.