Regum et imperatorum apophthegmata

When Dion, who expelled Dionysius from his kingdom, heard that a plot against him was being set on foot by Callippus, in whom he placed the greatest trust above all other friends, both those at home and those from abroad, he could not bring himself to investigate, but said, It is better to die than to live in a state of continual watchfulness not only against one’s enemies but also against one’s friends. [*](Cf. Plutarch’s Life of Dion, chap. lvi. (982 D)). The story of the plot and the death of Dion is in chaps. liv.-lvii. Cf. also Valerius Maximus, iii. 8. Ext. 5.)