The Trivium is the teaching originally from Aristotles about the basic process of observation (Grammatika), Application of Logig (Dialektik) on the observed matter and the communication of the resulting model (Rethorik).
In the name of the rose, the film after ECO, the actual historic book of the story is Trivium. The mentioned subject about satire is only part of it. The importance of this movie becomes apparent if one knows that exactly this book was hidden from the public for the very reason to use its content for suppression of the masses.
Critical Thinking Methodology : Trivium Quadrivium, HOW TO THINK NOT WHAT
View this very nice presentation about Hypnagogia:
Logic, Fallacies, and the Trivium. Tony Myers Interviews Jan Irvin: