Chris Jericho became the first WWE Undisputed Champion by defeating The Rock and Stone Cold Steve Austin at Vengeance 2001.
The tournament-style event was held on December 9, 2001, in San Diego, California. Jericho first defeated The Rock for the WCW Championship, then defeated Stone Cold Steve Austin for the WWF Championship later that night. The two victories unified the company’s major world titles.
The championship was initially called the Undisputed WWF Championship. After the company became WWE in 2002, it was renamed the Undisputed WWE Championship. Jericho’s reign lasted until Royal Rumble 2002, when he lost the title to The Rock.
This achievement is sometimes confused with simply winning both major world titles at different points in a career. Jericho’s distinction was becoming the first person to hold both championships simultaneously through the same night.