Pirandello's Henry IV

In this meeting of two noted playwrights, Tom Stoppard has made a new version of Luigi Pirandello's masterpiece of madness and sanity. After a fall from his horse, an Italian aristocrat wakes up believing he is the medieval German emperor Henry IV. Twenty years later the woman he once loved visits him, accompanied by her lover and psychiatrist, who plans to shock "Henry" back to sanity. But is "Henry" as mad as they think? And what is madness anyway?