#1. CM Punk becomes the longest-reigning WWE Champion of the modern era - December 5th, 2012
CM Punk is currently employed by AEW, but the self-proclaimed Best In The World left quite a legacy in WWE. CM Punk's record championship reign ran from November 20th, 2011 through to Royal Rumble 2013. The star held the title for 434 days.
Punk had to surpass several lengthy title reigns en route to his record, which included John Cena. The former champion held the title for 381 days in late 2006 and this was a record that Punk was able to overcome on December 5th, 2012.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
The former Champion officially became the longest-reigning Champion of the modern era on this day almost a decade ago.
Roman Reigns has since been able to break this record with his current reign, which currently stands at 461 days. Of course, Punk's was with the WWE Championship and Reigns currently holds the Universal Championship, so it's unclear as to whether or not the company sees this in the same bracket.