Read comic: Star Wars: Tales of the Jedi - The Golden Age of the Sith

comic
Summary:

Five millennia before Luke Skywalker was born — and 1,000 years before two young Jedi reawakened a long-dormant evil — the dark power of The Sith held unquestioning rule over the galaxy. For those black-souled, corrupt Jedi, it was a golden age. For the rest of the galaxy, it was a nightmare.