Passage 1.9.5
ὁ δὲ Λυσίμαχος οὗτος γένος τε ἦν Μακεδὼν καὶ Ἀλεξάνδρου δορυφόρος, ὃν Ἀλέξανδρός ποτε ὑπʼ ὀργῆς λέοντι ὁμοῦ καθείρξας ἐς οἴκημα κεκρατηκότα εὗρε τοῦ θηρίου· τά τε οὖν ἄλλα ἤδη διετέλει θαυμάζων καὶ Μακεδόνων ὁμοίως τοῖς ἀρίστοις ἦγεν ἐν τιμῇ. τελευτήσαντος δὲ Ἀλεξάνδρου Θρᾳκῶν ἐβασίλευεν ὁ Λυσίμαχος τῶν προσοίκων Μακεδόσιν, ὅσων ἦρχεν Ἀλέξανδρος καὶ ἔτι πρότερον Φίλιππος· εἶεν δʼ ἂν οὗτοι τοῦ Θρᾳκίου μοῖρα οὐ μεγάλη. Θρᾳκῶν δὲ τῶν πάντων οὐδένες πλείους εἰσὶ τῶν ἀνθρώπων ὅτι μὴ Κελτοὶ πρὸς ἄλλο ἔθνος ἓν ἀντεξετάζοντι, καὶ διὰ τοῦτο οὐδείς πω πρότερος Θρᾷκας Ῥωμαίων κατεστρέψατο ἀθρόους· Ῥωμαίοις δὲ Θρᾴκη τε πᾶσά ἐστιν ὑποχείριος, καὶ Κελτῶν ὅσον μὲν ἀχρεῖον νομίζουσι διά τε ὑπερβάλλον ψῦχος καὶ γῆς φαυλότητα, ἑκουσίως παρῶπταί σφισι, τὰ δὲ ἀξιόκτητα ἔχουσι καὶ τούτων.
This Lysimachus was by descent a Macedonian and a bodyguard of Alexander. Once, in anger, Alexander had confined him in a chamber with a lion, but later found that Lysimachus had overpowered the beast. Henceforth Alexander continually admired him greatly, and honored him equally with the most distinguished Macedonians. After Alexander's death, Lysimachus became king of those Thracians neighboring Macedonia, whom Alexander and, before him, Philip had subdued; these, however, comprised but a small portion of Thrace. Now the Thracians as a whole are more numerous than any other people except the Celts, if compared nation for nation, and for this reason no one before the Romans had completely subjugated the entire Thracian race. But now all Thrace is subject to Rome, and even among the Celts they willingly neglect those parts which they deem worthless because of the severe cold and poor soil, controlling only the lands that seem valuable enough for possession.