Who Says: "Though This Be Madness - There Is Some Method In It"?

Shakespeare's longest play, The Tragedy of Hamlet, Prince of Denmark, often shortened to Hamlet, is a tragedy written between 1599 and 1602. Set in Denmark, the play dramatises the revenge Prince Hamlet is called to wreak upon his uncle, Claudius, by the ghost of Hamlet's father, King Hamlet. Claudius had murdered his own brother and seized the throne, also marrying his deceased brother's widow.