Attila the Hun
-speaks for itself, look it up and you'll be terrified

-They've sacked multiple capitals filled with innocents, or irregular soldiers for plunder and slaughter.

-destroyed countless historical artifacts and records

-set back modern society by centuries

-need i say more?

Despotism > Barbarism

Sorry, despotism is not a legitimate or ever actually government.

Oligarchy > Barbarism

And of course

Republic > Oligarchy