Chris Jericho didn't even realize that he was a Grand Slam Champion until Randy Orton became one by winning the United States Title.

The title of Grand Slam Champion in WWE can be quite a confusing one. That's because of the number of times championships have disappeared only to return and also new titles have been created. Thanks to that, there are actually two different eras of Grand Slam Champions, but to become one you basically need to have won a World Title, two other singles titles, and a Tag Team Championship.

That means in present day WWE, you need to have been a World Champion, a Tag Champion, the United States Champion and Intercontinental Champion. There are currently ten Superstars who have achieved that feat and the latest man to join the club was Randy Orton when he defeated Bobby Roode for the US Title at Fastlane a couple of weeks ago.

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Orton was the first Superstar to achieve the feat since Roman Reigns managed it and before The Big Dog the last man to do it was Chris Jericho. Y2J also completed his collection by winning the United States Title. The trouble is Jericho claims that he didn't even know. On Talk Is Jericho, this week Y2J explained to his guest Chael Sonnen that he saw on social media that Orton became the first Grand Slam Champion since himself and that before those posts he didn't even know what a Grand Slam Champion was.

via wwe.com

What makes Jericho not knowing what a Grand Slam Champion was even worse is that he is one of only four Superstars to have completed the entire set of titles under both of its definitions. Back then, there was no US Title in WWE so a Superstar needed to win either the European or Hardcore Championship to qualify. Along with Y2J, the only Superstars to have been both types of Grand Slam Champion are Kurt Angle, Eddie Guerrero, and Big Show.

Much like the case with Orton, there was a lot of talk about Jericho becoming a Grand Slam Champion when he won the US Title last year, so it's hard to believe that he didn't really know what it was or that he was one. Whether he's telling the truth or not isn't clear, but what is clear is that he is in good company. There are only ten right now, but there will likely be a few others joining that elite group in the coming years, providing the definition of what makes you a Grand Slam Champion doesn't change again that is.

NEXT: RANDY ORTON COMPLETES CAREER MILESTONE