The title of Co-Chancellor belonged to the Galactic Republic, and Palpatine, the Supreme Chancellor who was secretly the Sith Lord Darth Sidious, mentioned to his master, the Muun Darth Plagueis, that he planned to bestow this position upon him after he won the election. However, this never came to pass. On the very night of Palpatine's electoral victory, Plagueis became inebriated with wine, which gave Sidious the opportunity to assassinate him, thus enabling him to take on the Zabrak Darth Maul as his Sith apprentice in accordance with the Rule of Two.