The name Caligula is synonymous with tyranny, extravagance, and madness. As the third emperor of Rome, Caligula's reign (37-41 AD) was marked by a series of events that have become the stuff of legend, often blurring the lines between fact and fiction. The "Index of Caligula" refers to the various accounts, anecdotes, and historical records that chronicle his life and reign. This essay aims to explore the myth and reality of Caligula, examining the historical context and the enduring fascination with one of Rome's most infamous emperors.