Macbeth and Banquo, generals in the service of King Duncan of Scotland, are returning victorious from battle when they are hailed by three witches who predict that Macbeth will become Thane of Cawdor and then King of Scotland, whereas Banquo's descendants will be kings.
The first part of the prophecy is soon fulfilled when Duncan rewards Macbeth's loyal service. Encouraged by this, and playing on her husband's ambition, Lady Macbeth persuades him to set out on the path to murder !
