In the book Caligula: A Biography, the main aim of the authors is to show a historical account of the life and reign of Caligula as Emperor of the Roman Empire . The authors take into account several ancient writers who have chronicled his life and, through their own research, attempt to affirm or discredit their many wild claims. The book begins with accusations from ancient writers such as Seneca, Pliny the Elder, Josephus, and Suetonius who all claim that Caligula suffered from madness. It is obvious that the authors do not believe this claim, and throughout the book they attempt to prove their theory. Instead, they portray him as an evil genius with ulterior motives for his actions. They note that Suetonius suggests that Caligula committed incest with his sisters, but use the fact that Seneca and Philo of Alexandria did not, as a means of discrediting this notion. They begin by telling the story of how Caligula's great-uncle Tiberius was chosen to rule after the death of Augustus, Caligula's great-grandfather. An account of Caligula's family...