Oh, I’m being fucking stupid. Sulla, of course, who took indefinite dictatorial power to reform the Roman Republican government to get rid of those pesky democratic plebbish influences, and then legitimately retired to a nice Mediterranean island with his actor boytoy, and died of worms in his gut (good riddance). Though, like the other three, that’s in the context of… not democratic, per se, but let’s say being replaced by constitutional government.