“Where are the Sith?” Plagueis allowed a smile. “Just now there is only one. Unless, of course, it is your will to join me.” Palpatine nodded. “I do wish to join you.” “Then kneel before me and pledge that it is your will to join your destiny forever with the Order of the Sith Lords.” Palpatine stared at the floor, then genuflected, uttering, “It is my will to join my destiny forever with the Order of the Sith Lords.” Plagueis extended his left hand to touch him on the crown of the head. “Then it is done. From this day forward, the truth of you, now and forever more, will be Sidious.”
