Plutarch Caesar 63

[1] But destiny, it would seem, is not so much unexpected as it is unavoidable, since they say that amazing signs and apparitions were seen. Now, as for lights in the heavens, crashing sounds borne all about by night, and birds of omen coming down into the forum, it is perhaps not worth while to mention these precursors of so great an event;

[2] but Strabo the philosopher says ¹ that multitudes of men all on fire were seen rushing up, and a soldier’s slave threw from his hand a copious flame and seemed to the spectators to be burning, but when the flame ceased the man was uninjured; he says, moreover, that when Caesar himself was sacrificing, the heart of the victim was not to be found, and the prodigy caused fear, since in the course of nature, certainly, an animal without a heart could not exist.

[3] 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: Aye, they are come, but they are not gone.

[4] 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 else could answer Caesar cried out: That which is unexpected.

[5] 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.

[6]
  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 enquire by other modes of divination and by sacrifices concerning the future.

[7] 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.