Foreshadow

Caesar has been warned by prophets (seers, augurs) that he should not go to the capital today because it would not be good for him. The people cannot know what is going to happen; still, there is something on the horizon and the people have a bad feeling about it.

we see forshadowing as early as act 1 scene II when Ceasar speaks with to Anthony and says to be wary of Cassius because of his "lean and hungry look" and because "he thinks too much"

There is also when his death is predicted by many ; Calpurnia, The soothsayer and Artemidorus