Passage 1.11.3
ἦν δὲ ἄχρι μὲν Ἀλκέτου τοῦ Θαρύπου ἐφʼ ἑνὶ βασιλεῖ καὶ τὰ Ἠπειρωτῶν· οἱ δὲ Ἀλκέτου παῖδες, ὥς σφισι στασιάσασι μετέδοξεν ἐπʼ ἴσης ἄρχειν, αὐτοί τε πιστῶς ἔχοντες διέμειναν ἐς ἀλλήλους καὶ ὕστερον Ἀλεξάνδρου τοῦ Νεοπτολέμου τελευτήσαντος ἐν Λευκανοῖς, Ὀλυμπιάδος δὲ διὰ τὸν Ἀντιπάτρου φόβον ἐπανελθούσης ἐς Ἤπειρον, Αἰακίδης ὁ Ἀρύββου τά τε ἄλλα διετέλει κατήκοος ὢν Ὀλυμπιάδι καὶ συνεστράτευσε πολεμήσων Ἀριδαίῳ καὶ Μακεδόσιν, οὐκ ἐθελόντων ἕπεσθαι τῶν Ἠπειρωτῶν.
Now until the time of Alcetas, the son of Tharypus, Epirus also was governed by a single king. But the sons of Alcetas, after quarreling among themselves, agreed that they would henceforth rule as equals; and thereafter they remained loyal towards one another. Later, after Alexander the son of Neoptolemus had died among the Lucanians, and Olympias, because of fear of Antipater, had returned to Epirus, Aeacides, the son of Arybbas, continued in all else obedient to Olympias, and even aided her with an army against Arrhidaeus and the Macedonians, though the Epirotes were unwilling to follow him.