Serenno / Legends Serenno was a planet in the Outer Rim Territories . It was known for its aristocratic Counts , the most famous of them being Dooku . It was also well known for its long history of resisting authority . History . The Old Republic . In about 3661 BBY , during the Great Galactic War , Serenno was attacked and captured by the forces of the Sith Empire , under the command of the Sith Lord Darth Malgus . One thousand years before the Battle of Yavin Serenno was governed by the six Great Houses to which the Counts of Serenno belonged ; the Counts were amongst the wealthiest beings in the galaxy and believed in " " and self - reliance . Two of the six Great Houses were Nalju and Demici . Other lesser noble families allied themselves with the Six or were distant relatives . Serenno capital backed many projects of the Galactic Republic of which the planet was a valued member , despite being a frequent hotbed of sedition . In 990 BBY , the planet was the site of anti - Republic agitation , and a failed kidnapping attempt of former Supreme Chancellor Tarsus Valorum , both of which failed due to the manipulations of Darth Zannah . Since the kidnapping attempt involved killing servants and attacking a guest under the protection of Count Nalju , it offended the Great Houses , which quickly took steps to eliminate the seditious movements . Separatist heartland . Nearly a millennium later , Serenno gave rise to a far more dangerous rebel demagogue . Dooku was born on Serenno in 102 BBY . His family bore the title of Count and lived in a great house with rose bushes . Dooku once visited the seashell - littered shores of a Serenno ocean as a child . After resigning from the Jedi Order in the aftermath of the Battle of Galidraan , Dooku returned to Serenno and resumed his hereditary title as Count , giving him control of the vast fortune controlled by his family . The planet acted as one of his strongholds during the Clone Wars . After murdering Jedi Master Sifo - Dyas , Dooku stored his cryogenically frozen body on the planet , to be retrieved several years later for transportation to Geonosis , where a blood transfusion between the dead Jedi and Qymaen jai Sheelal occurred . As the Clone Wars progressed , Dooku kept his castle on Serenno and used it as a base of operations from time to time . On one occasion , Darth Sidious contacted Dooku in his palace via hologram and ordered him to kill his apprentice Asajj Ventress , who was growing too powerful and posed a threat to the Sith . Ventress survived , and in retaliation , she led the Dathomiri Nightsisters Karis and Naa ' leth to raid Dooku ' s palace and kill him . Despite their concealment power , Ventress and her two allies were no match for Dooku , who used the Force to hurl the three assailants out of the palace , a fall from which they barely survived . After the Skirmish , Dooku received a message from a old " acquaintance " , Mother Talzin , who offered him a new apprentice , the brother of Darth Maul , Savage Opress . Opress was delivered to Dooku by Mother Talzin and a couple of her Nightsisters . It was here Dooku started to train Opress as his new apprentice through brutal exercises . After this Dooku brought eleven of the galaxy ' s best bounty hunters , which included Cad Bane and Obi - wan Kenobi , disguised as Rako Hardeen . Dooku wanted to test to see who was worthy to take part in Moralo Eval ' s plot to kidnap the Republic Supreme Chancellor . Dooku then put them in Eval ' s Box to test them . When the Confederacy of Independent Systems was forced onto the defensive in 19 BBY during the Outer Rim Sieges , Serenno was at the heart of the Serenno theater , the Republic ' s offensive into Separatist territories in the Northern Dependencies . The Republic drove to Serenno from New Bornalex and Ord Radama , hoping to clear the way to the hyperspace crossroads of Celanon and Dooku ' s homeworld . Imperial era . Even after the defeat of the Confederacy of Independent Systems and the formal end of the Clone Wars in 19 BBY , shadowy interests on Serenno continued to back Separastist holdouts . During the Ciutric Offensive , Separatist forces that had fled from Muunilinst and Mygeeto into the Ciutric sector were funded by Serenno , while Serennian mercenaries assisted in breaking the Imperial Siege of Binquaros and helping the Separatists there evacuate .