"The following story, too, is told by many. A certain seer warned Caesar to be on his guard against a great peril on the day of the month of March which the Romans call the Ides; and when the day had come and Caesar was on his way to the senate-house, he greeted the seer with a jest and said: 'Well, the Ides of March are come,' and the seer said to him softly: 'Ay, they are come, but they are not gone.' Moreover, on the day before, when Marcus Lepidus was entertaining him at supper, Caesar chanced to be signing letters, as his custom was, while reclining at table, and the discourse turned suddenly upon the question what sort of death was the best; before any one could answer Caesar cried out: 'That which is unexpected.'
"After this, while he was sleeping as usual by the side of his wife, all the windows and doors of the chamber flew open at once, and Caesar, confounded by the noise and the light of the moon shining down upon him, noticed that Calpurnia was in a deep slumber, but was uttering indistinct words and inarticulate groans in her sleep; for she dreamed, as it proved, that she was holding her murdered husband in her arms and bewailing him. Some, however, say that this was not the vision which the woman had; but that there was attached to Caesar's house to give it adornment and distinction, by vote of the senate, a gable-ornament, as Livy says, and it was this which Calpurnia in her dreams saw torn down, and therefore, as she thought, wailed and wept. At all events, when day came, she begged Caesar, if it was possible, not to go out, but to postpone the meeting of the senate; if, however, he had no concern at all for her dreams, she besought him to inquire by other modes of divination and by sacrifices concerning the future. And Caesar also, as it would appear, was in some suspicion and fear. For never before had he perceived in Calpurnia any womanish superstition, but now he saw that she was in great distress. And when the seers also, after many sacrifices, told him that the omens were unfavourable, he resolved to send Antony and dismiss the senate.
 "But at this juncture Decimus Brutus, surnamed Albinus, who was so trusted by Caesar that he was entered in his will as his second heir, but was partner in the conspiracy of the other Brutus and Cassius, fearing that if Caesar should elude that day, their undertaking would become known, ridiculed the seers and chided Caesar for laying himself open to malicious charges on the part of the senators, who would think themselves mocked at; for they had met at his bidding, and were ready and willing to vote as one man that he should be declared king of the provinces outside of Italy, and might wear a diadem when he went anywhere else by land or sea; but if some one should tell them at their session to be gone now, but to come back again when Calpurnia should have better dreams, what speeches would be made by his enemies, or who would listen to his friends when they tried to show that this was not slavery and tyranny? But if he was fully resolved (Albinus said) to regard the day as inauspicious, it was better that he should go in person and address the senate, and then postpone its business. While saying these things Brutus took Caesar by the hand and began to lead him along.
"And he had gone but a little way from his door when a slave belonging to some one else, eager to get at Caesar, but unable to do so for the press of numbers about him, forced his way into the house, gave himself into the hands of Calpurnia, and bade her keep him secure until Caesar came back, since he had important matters to report to him.
 "Furthermore, Artemidorus, a Cnidian by birth, a teacher of Greek philosophy, and on this account brought into intimacy with some of the followers of Brutus, so that he also knew most of what they were doing, came bringing to Caesar in a small roll the disclosures which he was going to make; but seeing that Caesar took all such rolls and handed them to his attendants, he came quite near, and said: 'ead this, Caesar, by thyself, and speedily; for it contains matters of importance and of concern to thee.'Accordingly, Caesar took the roll and would have read it, but was prevented by the multitude of people who engaged his attention, although he set out to do so many times, and holding in his hand and retaining that roll alone, he passed on into the senate. Some, however, say that another person gave him this roll, and that Artemidorus did not get to him at all, but was crowded away all along the route.
 "So far, perhaps, these things may have happened of their own accord; the place, however, which was the scene of that struggle and murder, and in which the senate was then assembled, since it contained a statue of Pompey and had been dedicated by Pompey as an additional ornament to his theatre, made it wholly clear that it was the work of some heavenly power which was calling and guiding the action thither. Indeed, it is also said that Cassius, turning his eyes toward the statue of Pompey before the attack began, invoked it silently, although he was much addicted to the doctrines of Epicurus; but the crisis, as it would seem, when the dreadful attempt was now close at hand, replaced his former cool calculations with divinely inspired emotion."
Plutarch, Life of Caesar