In Act 1 of Shakespeare's "Macbeth," the stage is set for the tragedy that follows. The play begins with three witches who plan to meet Macbeth, foreshadowing dark events. King Duncan of Scotland hears of Macbeth's bravery in battle and decides to make him Thane of Cawdor, a title that had belonged to a traitor. Meanwhile, Macbeth and his friend Banquo encounter the witches. The witches prophesy that Macbeth will become Thane of Cawdor and then King, and that Banquo's descendants will also be kings. When Macbeth is officially made Thane of Cawdor, he starts to believe the prophecy.
Back at Macbeth's castle, Lady Macbeth reads a letter from her husband about the prophecies. When she learns King Duncan is coming to visit, she sees an opportunity for Macbeth to fulfill the prophecy by murdering Duncan and seizing the throne. Despite his doubts and the moral implications, Macbeth is persuaded by Lady Macbeth's ambition and determination. The act ends with Macbeth contemplating the enormity and consequences of the deed he is about to commit. Act 1 thus establishes the key themes of ambition, power, supernatural influence, and the moral struggle that will drive the rest of the play.