Roman Reigns has arguably solidified his legacy as the greatest pro wrestler ever in the history of the WWE and professional wrestling as a whole. He's dominated the business since returning to the WWE in 2020 and there's seemingly no stopping.
With his ongoing Universal Championship reign, he's already broken several records and there are many more that's yet to follow. Recently, he has crossed yet another incredible milestone in the WWE which led to another record beyond the TKO-owned company.

Just a couple of days ago, Roman Reigns crossed 1238 days as the WWE Universal Champion and Bruno Sammartino's second WWE Title reign. Therefore, he now possesses the fourth-longest WWE title reign in history right now.
Also, as pointed out by Reddit user ItsMichaelRay, Roman Reigns now possesses the tenth-longest-reigning champion of any title WWE has ever recognized (from the mainstay brand and the other brand that they have taken over).
The Fabulous Moolah's reign as Women's Champion tops the list as she remains the recognized longest champion in the WWE so far, at 10170 days. The full list of champions shared by the source goes as follows:
Roman Reigns is currently booked to defend his undisputed title at Royal Rumble in a fatal-4-way encounter on January 27th. Plus, a dream match against The Rock is also said to be in the pipeline at WrestleMania 40 in April.