I mean, "Alexander the Great" was a great man by common definition. That should be pretty obvious. I'd expand that to other great conquerors - Genghis Khan, Napoleon, and many others.

Does Hitler really not belong on a list like that? So would Stalin, Churchill and Roosevelt, of course - but I don't think greatness requires goodness.

Or from popular culture:

> “The wand chooses the wizard, remember … I think we must expect great things from you, Mr Potter … After all, He Who Must Not Be Named did great things – terrible, yes, but great.” - Ollivander