The witches and their prophecies are the first major influence on Macbeth’s actions. The three witches planted the seed of ambition within Macbeth. They were the driving force behind Banquo and King Duncan's killing. The witches prophesized that his life would completely change, by becoming thane of Cawdor, then king of Scotland. At first, Macbeth dismissed their prophecies, but after he was promoted to Thane of Cawdor, Macbeth wondered if he will be King, too. "If chance will have me king, why chance may crown me without my stir." Another prophecy made by the witches was that Banquo's son will be king. Fuelled by paranoia, lack of sleep and visions, Macbeth was thrown into a state of confusion and a belief that the prophecies were inevitable.
Macbeth comes to the realization that for him to in fact become King, he will have to defeat recently named heir to the throne, Malcolm, the King’s son, and also prevent Banqou’s son from gaining access to the throne. Macbeth returns home and he and his wife must play host to the King. Lady Macbeth urged her husband to commit murder and it was this action that sparked Macbeth's downfall. When Lady Macbeth heard about the prophecies made by the witches, and how one of them had already come true, she called upon evil spirits to guide