Codex/Galactic History 85: The Purge of the Dark Council

The Galactic History 85: The Purge of the Dark Council codex entry is located within the Achievements:Datacrons section of a player's codex once it has been unlocked.

Codex entry
"This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:

After the Great Hyperspace War, the Sith Emperor had successfully led his people to the sanctuary of Dromund Kaas. Having re-established the Empire there, he slowly withdrew from public life, leaving the Empire’s administration to his Dark Council.

At first the Dark Council was subservient to the Emperor. But as centuries passed and the Emperor remained withdrawn, the Dark Council became more independent, believing he was weakening. When the council discovered the Emperor was planning to invade the Republic, there was angry dissent. Naga Sadow’s failed invasion of the Republic a millennium before had almost destroyed the Empire; some believed it would be madness to repeat his mistake.

Several of the Dark Council’s members decided to depose the Emperor before he led them to destruction. But the Emperor learned of their intentions and the entire Dark Council, loyalists and dissenters alike, was purged. The price of disobedience made clear, a new council was chosen and the Emperor’s plans proceeded."