In this study Edmund Creeth discovers an intimate, unique, and previously unsuspected kinship between three Shakespearean tragedies—Macbeth, Othello, and King Lear—and the three oldest extant theological dramas about Mankynde—The Castell of Perseverance, Wisdom Who Is Christ, and The Pride of Life. Creeth’s revolutionary discovery of parallels between the two sets of plays and his innovative method of studying these parallels suggest provocative new ways of looking at Shakespeare’s tragedies and constitute a major new direction in Shakespearean scholarship.