Macbeth: The Murder In the beginning of the play, Macbeth and Banquo meet three witches. The witches predict that Macbeth will be Thane of Glamis, Thane of Cawdor, and king. They tell Banquo that his sons will become kings. At that point Macbeth was already Thane of Glamis because of his father. He also had been named Thane of Cawdor, but he hadn't found out yet. This all made him think that maybe someday he could be king, but he didn't know how. At first Macbeth was hesitant about killing Duncan, but Lady Macbeth persuaded him into doing it. Duncan was coming to Macbeth's Castle to spend the n