King John had a distinguished life on the eighteenth and nineteenth-century stage, and this edition presents the fullest account of its stage history. The play’s political importance, its rich and varied language, and its skillful design suggest that King John deserves a high place among Shakespeare’s historical tragedies. The textual analysis includes examination of several disputed emendations to the text. In the appendix, Beaurline surveys the arguments about the dating of Shakespeare’s King John and the anonymous Troublesome Reign of King John, presenting new evidence for the possibility that Shakespeare’s play was written first.