From its inception until 2001, it was promoted as WWE's sole primary championship. An additional world title, the WCW Championship, was added after the then-World Wrestling Federation's purchase of World Championship Wrestling in early 2001. The titles were later unified as the Undisputed Championship. After the first brand split in 2002 and the promotion being renamed to WWE, the championship became exclusive to SmackDown, and the World Heavyweight Championship was created for Raw. ECW became a third brand in 2006, adding the ECW Championship. That title was deactivated in 2010, and the World Heavyweight Championship was unified into the WWE Championship in 2013. The championship was again the sole world title of WWE until the introduction of the Universal Championship with the 2016 brand split. During both brand splits, the WWE Championship has switched brands, usually as a result of the WWE Draft; in 2019, the title moved to Raw after then-champion Brock Lesnar quit SmackDown following the events of Crown Jewel.