The Duke of Mantua is a fictional character from the opera *Rigoletto*, composed by Giuseppe Verdi. He is portrayed as a charming yet morally ambiguous nobleman who pursues romantic interests without regard for the consequences of his actions. His character is central to the opera's themes of love, betrayal, and tragedy. In the story, the Duke is known for his famous aria "La donna è mobile," where he expresses his views on the fickleness of women. The opera is set in the Italian city of Mantua during the Renaissance, highlighting the social dynamics and power struggles of the time.