Answer
The Emperor is a satire because it parallels the downfall of Haile Selassie and Communist Poland. The book's main character, Emperor Haile Selassie, is a thinly veiled stand-in for the real-life emperor, who was overthrown in a coup d'état in 1974. The book also contains many references to Communist Poland, which was in a state of political and economic turmoil at the time.