"Feared, obeyed, and admired among the Sith, he was considered to have been the greatest Dark Lord of the Sith of his time. The details of his century-long reign are few, although his death marked the end of the golden age of the Sith Empire, despite his reluctance to continue expansion. Before his death, he likely composed the epistle of Marka Ragnos. Immediately following his funeral, a schism erupted between the leaders of the Sith, and further events led to a major war with the Galactic Republic and ultimately, because the schism was never healed, the end of their interstellar empire."-Wookiepedia