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Who are the most depraved and brutal rulers pre 1900?
Depraved: marked by corruption or evil; perverted
I'm talking rulers who displayed little to no regard for human life, sadistic tendencies, mental instability, psychosis, psychopathy, or any combination thereof.
Also rulers who lived decadent lifestyles equivalent to the cocaine fueled orgies of our time.
Explain why you feel they meet the criteria of evil written above.