The tales vary widely: they include historical tales, love stories, tragedies, comedies, poems, burlesques, and various forms of erotica. Numerous stories depict jinn, ghouls, apes, sorcerers, magicians, and legendary places, which are often intermingled with real people and geography, not always rationally. Common protagonists include the historical Abbasid caliph Harun al-Rashid, his Grand Vizier, Jafar al-Barmaki, and the famous poet Abu Nuwas, despite the fact that these figures lived some 200 years after the fall of the Sassanid Empire, in which the frame tale of Scheherazade is set. Sometimes a character in Scheherazade's tale will begin telling other characters a story of his own, and that story may have another one told within it, resulting in a richly layered narrative texture.