Macbeth full title The Tragedie of Macbeth is a tragedy by William Shakespeare. It is thought to have been first performed in 1606. It dramatises the damaging physical and psychological effects of political ambition on those who seek power. Of all the plays that Shakespeare wrote during the reign of James I, Macbeth most clearly reflects his relationship with King James, patron of Shakespeare's acting company. It was first published in the Folio of 1623, possibly from a prompt book, and is Shakespeare's shortest tragedy.

Amid thunder and lightning, Three Witches decide that their next meeting will be with Macbeth. In the following scene, a wounded sergeant reports to King Duncan of Scotland that his generals Banquo and Macbeth, the Thane of Glamis, have just defeated the allied forces of Norway and Ireland, who were led by the traitorous Macdonwald, the Thane of Cawdor. Macbeth, the King's kinsman, is praised for his bravery and fighting prowess.

In the following scene, Macbeth and Banquo discuss the weather and their victory. As they wander onto a heath, the Three Witches enter and greet them with prophecies. Though Banquo challenges them first, they address Macbeth, hailing him as "Thane of Glamis," "Thane of Cawdor," and that he will "be King hereafter". Macbeth appears to be stunned to silence. When Banquo asks of his own fortunes, the witches respond paradoxically, saying that he will be less than Macbeth, yet happier, and less successful, yet more. He will father a line of kings, though he himself will not be one. While the two men wonder at these pronouncements, the witches vanish, and another thane, Ross, arrives and informs Macbeth of his newly bestowed title: Thane of Cawdor. The first prophecy is thus fulfilled, and Macbeth, previously sceptical, immediately begins to harbour ambitions of becoming king.