This study of Giordano Bruno's "Candelaio" examines a large number of theatrical authors, from the classical tradition as well as from Italian vernacular and dialect. It takes into account the author's recognised sources as well as unknown authors, philosophers as well as poets, playwrights and "poligrafi della penna". The studyconcludes that it is the central impluse of "Candelaio": a polemic against interlectual obscurantism and degenderated morals. This meaning explains and jusitfies, emblematically, the title itself. Thus, by name, the play declares it's function, to clarify and enlighten.