What Was the Witches' Role in Macbeth? In Shakespeare's time, many people were superstitious; they believed that that their lives were strongly influenced, if not dictated by fate. They also thought that the world was full of supernatural creatures, such as witches, ghosts, and many other such beings. Shakespeare incorporated these aspects of belief in his play Mac Beth. The witches, although accurately predicting what would occur, i.e., Mac Beth would be king, they did not specify how their prophecies would be realized. The witches did possess some sort of power (unless they were privy to some poli