An Emperor was a ruler who held absolute authority over a vast territory. The female version of this title was Empress. The Atrisian Emperors, such as the 14th Atrisian Emperor, governed the world of Kitel Phard. Sheev Palpatine, who secretly operated as the Sith Lord Darth Sidious and held the title of Supreme Chancellor, orchestrated the Clone Wars and fulfilled the Grand Plan of the Sith. At the conclusion of the war, he took on the title of Galactic Emperor, thereby changing the Republic into the Galactic Empire.
Following Sidious's demise, the title of Galactic Emperor ceased to be used; even the strandcast Snoke did not try to take it, despite being the Supreme Leader of the First Order. Kylo Ren, the grandson of Darth Vader, aimed to take control of the entire galaxy as the new Supreme Leader of the First Order. Sidious, having returned to life through cloning, offered to assist Ren in becoming the next Emperor. After Ren embraced the light side of the Force and became Ben Solo once more, Sidious encouraged his granddaughter, the Jedi Padawan Rey, to succumb to the dark side and claim the Throne of the Sith as Empress. Ultimately, Sidious abandoned his plan to inhabit Rey's body when he discovered the true nature of the Force-bond between Solo and Rey; they were a dyad in the Force. Although he managed to rejuvenate his cloned body using the dyad's power, Sidious' final destruction put an end to his ambition of ruling a Sith Empire as an eternal Emperor.