""The Duke of Mantua: A Tragedy"" is a play written by John Roby. The story revolves around the Duke of Mantua, a powerful and wealthy ruler who is deeply in love with a woman named Isabella. However, Isabella is already married to another man, and the Duke's obsession with her leads him down a path of destruction and tragedy. As the Duke's actions become increasingly erratic and dangerous, those around him begin to fear for their lives and the stability...