The document provides an introduction to William Shakespeare's play "The Tragedy of Macbeth". It describes how the story is opened with Macbeth impressing King Duncan in battle against invading forces. Macbeth and Banquo later encounter three witches who predict Macbeth will become king, fueling his ambition. Lady Macbeth encourages Macbeth to murder King Duncan when he stays at their castle, in order to seize the throne.