Passage 1.10.1
Λυσιμάχῳ δὲ ἐπὶ μὲν Ἀριδαίου βασιλεύοντος καὶ ὕστερον Κασσάνδρου καὶ τῶν παίδων φιλία διέμεινε πρὸς Μακεδόνας· περιελθούσης δὲ ἐς Δημήτριον τὸν Ἀντιγόνου τῆς ἀρχῆς, ἐνταῦθα ἤδη Λυσίμαχος πολεμήσεσθαι ἤλπιζεν ὑπὸ Δημητρίου καὶ αὐτὸς ἄρχειν ἠξίου πολέμου, πατρῷον ἐπιστάμενος ὂν Δημητρίῳ προσπεριβάλλεσθαί τι ἐθέλειν καὶ ἅμα ὁρῶν αὐτὸν παρελθόντα ἐς Μακεδονίαν μετάπεμπτον ὑπὸ Ἀλεξάνδρου τοῦ Κασσάνδρου, ὡς δὲ ἀφίκετο, αὐτόν τε Ἀλέξανδρον φονεύσαντα καὶ ἔχοντα ἀντʼ ἐκείνου τὴν Μακεδόνων ἀρχήν.
Under Lysimachus, as long as Aridaeus ruled and afterward Cassander and his sons, friendship with the Macedonians endured. But when sovereignty passed to Demetrius, son of Antigonus, Lysimachus then anticipated attack from Demetrius and resolved to be the first himself to initiate war; for he knew it to be Demetrius' hereditary disposition to strive always after something more, and moreover he observed that Demetrius, when summoned into Macedonia by Alexander son of Cassander, upon his arrival had murdered Alexander himself and seized with his own hands the throne of Macedon.