Sareth was a Saloi, and the head of the Removal Men. He was also the true emperor of the Saloi, though he was unaware of this for many years. Morweth was the acting ruler, but was created to be Sareth's bodyguard and a diversion from the truth.
When the leaders of the Saloi, Dakhaari and Czhan (Morweth, Ravla and Koth, respectively) met for peace talks, the Skrak attempted to have them assassinated. Morweth killed the three assassins, but was mortally wounded in the fight. He revealed that Sareth was the true emperor of the Saloi before he died.
After the Skrak were defeated, the three rulers entered into a political marriage to bring peace to the Dagellan Cluster. (PROSE: Death and Diplomacy)