Adelgitha; or, The Fruits of a Single Error is a haunting Gothic tragedy by Matthew Lewis that explores the harrowing plight of a fallen woman ensnared by the merciless blackmail of a tyrant after rejecting his advances. Set against the backdrop of Otranto during the High Middle Ages, the play intertwines the lives of historical figures such as Robert Guiscard and Michael Ducas, creating a rich tapestry of treachery, murder, and despair. This compelling narrative resonates today as it delves into themes of power, manipulation, and the consequences of a single choice, reminding us of the enduring struggles against tyranny and the vulnerabilities faced by those marginalized in society.