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This text is part of the play "Romeo and Juliet" written by Shakespeare. The passage introduces the story, in addition to giving an omen about how the story ends, as we can see that the city of Verona is presented as the place where two families have a strong hatred for each other, which causes a tragedy to arise between they. As we know, Romeo and Juliet are the children of two enemy families, but they fall in love with each other. The hatred between the two families does not allow them to be together, which causes the death of the two at the end of the story.
This process of postponing a point in history is called foreshadowing, which is a literary device where the author advances information in a subjective way, to stimulate the reader's curiosity.