The Cleansing of Serenno occurred shortly after the end of the Clone Wars, when Darth Vader drove the heirs of the Great Houses of Serenno to mass parricide. As a result, the Great Houses were brought in the bosom of the newly formed Galactic Empire, and Adan Dooku was appointed Count of Serenno, liege lord of all the other patricians on the planet. Most of the galactic community never knew what really happened on Serenno that day, only that the event had seen the replacement of the old heads of houses by their sons. Agent Jahan Cross of the Imperial Intelligence was one of the few to ever learn the true story of the Cleansing of Serenno, which he heard in 3 BBY from the mouth of Count Rodas Borgin, who had drawn the first blood during the massacre.