This two-hour History Channel special examines controversial new theories about the man who ruled the world's mightiest Empire with sadistic brutality. His reign of terror lasted just 1,400 days. Yet even today everyone knows his name. Most have said he was crazy. But was he? This is the story few know behind one of the most infamous figures of the Ancient World--Caligula.

"Caligula was insane. Or was he...?"