Which character is known for saying "Beware the Ides of March"?

The character known for saying "Beware the Ides of March" is the soothsayer. This line famously appears in William Shakespeare's play "Julius Caesar," where the soothsayer warns Caesar about the dangers he faces on March 15th, a day that ultimately becomes significant in the plot as it marks Caesar's assassination. The soothsayer serves as a prophetic figure, emphasizing themes of fate and forewarning within the play. His role highlights the importance of heeding warnings and the consequences of ignoring them, which foreshadows the tragic events that unfold. This line captures the essence of the tension between fate and free will, a central theme in the narrative.