"The Knights" is a satire on political and social life in 5th-century BC Athens, the characters are drawn from real life and Cleon is clearly intended to be the villain. However it is also an allegory, the characters are figures of fantasy and the villain in this context is Paphlagonian, a comic monstrosity responsible for almost everything that's wrong with the world. The identity Cleon=Paphlagonian is awkward and the ambiguities aren't easily resolved. This summary features the real-world names Cleon, Nicias and Demosthenes (though these names are never mentioned in the play). See Discussion for an overview of the ambiguous use of characterization in "The Knights".