“Once he accepted the cognomen Germanicus after two triumphs, he renamed the months of September and October from his own names, calling one Germanicus and the other Domitianus because he had assumed rule in one and was born in the other.
For these reasons he became a source of fear and hateful to everyone. He was finally overthrown by plots led together by his friends and freedman with his wife’s knowledge. He had a longstanding suspicion over the final year and day of his death. When he was young, astrologers had predicted all these things to him. His father also once mocked him at dinner because he was refusing mushrooms, claiming that he was ignorant of his fate because he did not fear the sword instead. For these reasons he was always fearful and anxious and was excessively upset even over the smallest suspicions.”
Post autem duos triumphos Germanici cognomine assumpto Septembrem mensem et Octobrem ex appellationibus suis Germanicum Domitianumque transnominavit, quod altero suscepisset imperium, altero natus esset.
XIV. Per haec terribilis cunctis et invisus, tandem oppressus est insidiis amicorum libertorumque intimorum simul et uxoris. Annum diemque ultimum vitae iam pridem suspectum habebat, horam etiam nec non et genus mortis. Adulescentulo Chaldaei cuncta praedixerant; pater quoque super cenam quondam fungis abstinentem palam irriserat ut ignarum sortis suae, quod non ferrum potius timeret. Quare pavidus semper atque anxius minimis etiam suspicionibus praeter modum commovebatur.
Dio Chrysostom, The Sixth Oration: On Diogenes or Tyranny 35-37
“[Diogenes] did not think it right to compare himself to the king of the Persians more—for there was a great difference. The king happened to be the most tried man of all since he dreaded poverty among so much wealth, feared sickness when he could not refrain from what caused it, worried terribly about death even as he believed that everyone was conspiring against him, including his children and brothers. For these reasons, he took no pleasure from eating, even though the greatest delicacies were available, nor could he forget his troubles by drinking. He lived no day easily when did not have the look of someone suffering terrible things. When he was sober, he wanted to be drunk, thinking that he would be freed from his suffering; but when he was drunk, he thought he would die because he was incapable of helping himself. And even more, when he was awake he prayed to sleep so that he might forget his fears, but while he was lying down, he leapt up quickly since he was being destroyed by dreams…”