A vicious, extravagant, unpredictable person, a senselessly cruel tyrant, a bloody despot... It seems that there are no negative qualities that the Roman emperor Gaius Caesar Germanicus, nicknamed Caligula, would not possess. Neither ancient nor modern historians had a single kind word for him. Even his, perhaps, only gift - eloquence - was used by Caligula mainly to insult and humiliate worthy people. Nevertheless, the author of this book, Doctor of Historical Sciences, Professor I. O. Knyazky, did not set out to describe only obscene fun and bloody massacres of a mediocre ruler, but tried to trace the history of how the son of the most worthy Romans became the worst of the Roman emperors.