Around the year 3636 BBY, Valkorion, the Emperor, dispatched his offspring, Prince Arcann and Prince Thexan, on a mission that spanned across the galaxy; these raids were designed to evaluate the power of the two major galactic powers: the Galactic Republic and the Sith Empire. The true nature of these assaults remained largely unknown to both governments.
Following the death of Valkorion and the subsequent incarceration of the Galactic War's celebrated figure, known only as the Commander, Arcann initiated a complete conquest of the galaxy.