The revolution, lead by the Inquisitor, successfully overthrew the Equestrian Triarchy, and established a "new government, for the ponies, by the ponies," officially aiming to bring prosperity to their nation.
It's been three years since the revolution, Twilight Sparkle fled when it became apparent that the Inquisitor's goals were less than benevolent, and she has been in hiding ever since. Despite repeated attempts by the Inquisitor to find her, none have been successful.
One thing is certain, however. While Twilight lives, the Inquisitor's days are numbered.