MMA's biggest name Conor McGregor once held the UFC and Cage Warriors featherweight and lightweight championships. He was the first-ever double champ in the UFC. However, let's take a look at how the Irishman lost his UFC belts.Interestingly, 'The Notorious' didn't lose his titles inside the caged ring. He vacated his UFC featherweight title in 2016 owing to his prolonged inactivity in the division.SportsCenter@SportsCenterTHIS JUST IN: Conor McGregor has vacated his featherweight title, elevating Jose Aldo to undisputed champion.64225013THIS JUST IN: Conor McGregor has vacated his featherweight title, elevating Jose Aldo to undisputed champion. https://t.co/cNUHasUshcAfter unifying the featherweight title by triumphing over Jose Aldo at UFC 194 Conor McGregor spent the next year fighting Nate Diaz twice at welterweight.He then crossed over to the lightweight division and defeated then-champion Eddie Alvarez to become the UFC's first ever two-division champion.MMA History Today@MMAHistoryTodayNovember 12 1993: UFC 1 takes place in Denver, ColoradoNovember 12 2011: The UFC holds its first event on FOXNovember 12 2016: The UFC holds its first event at Madison Square GardenNovember 12 2016: Conor McGregor becomes the first two-division Champion in UFC history10219November 12 1993: UFC 1 takes place in Denver, ColoradoNovember 12 2011: The UFC holds its first event on FOXNovember 12 2016: The UFC holds its first event at Madison Square GardenNovember 12 2016: Conor McGregor becomes the first two-division Champion in UFC historyHowever, he was later stripped of his lightweight strap due to inactivity in the division. After winning the belt from Alvarez, the Irishman took time off the octagon to fight boxing legend Floyd Mayweather in the squared circle.The UFC eventually set up a fight between Al Iaquinta and Khabib Nurmagomedov at UFC 223 for the undisputed lightweight championship.Mike Bohn@MikeBohnDana White confirms Khabib Nurmagomedov has "the only belt" in the lightweight division. Conor McGregor and Tony Ferguson have officially been stripped. #UFC223699191Dana White confirms Khabib Nurmagomedov has "the only belt" in the lightweight division. Conor McGregor and Tony Ferguson have officially been stripped. #UFC223Even though the Irishman met Nurmagomedov at UFC 229 in an effort to win the lightweight title back, he lost the bout via a fourth-round submission.As for his Cage Warriors titles, McGregor vacated them when he signed a multifight deal with the UFC in 2013.When Conor McGregor called out former welterweight champion Kamaru UsmanPerhaps UFC's biggest draw, Conor McGregor is looking to create history yet again by claiming a third UFC title.Last year, after Kamaru Usman's second win over Jorge Masvidal at UFC 261, McGregor suggested that he was coming for the the Nigerian's welterweight title. In a tweet, 'Notorious' stated:"Usman even copying my shots now. Am I to fight this guy at some stage? I think so. Can’t be copying my words and my shots and not get a smack for it. I like 170. It’s mine soon."Conor McGregor@TheNotoriousMMAUsman even copying my shots now. Am I to fight this guy at some stage? I think so. Can’t be copying my words and my shots and not get a smack for it. I like 170. It’s mine soon.473853217Usman even copying my shots now. Am I to fight this guy at some stage? I think so. Can’t be copying my words and my shots and not get a smack for it. I like 170. It’s mine soon. https://t.co/FEQgj9AsAyAlthough Usman lost his welterweight title to Leon Edwards earlier this year, McGregor's plans to return to the 170-pound division are still very much intact. In fact, in a recent tweet, the 34-year-old revealed that he was planning to make his UFC comeback as a welterweight.Conor McGregor@TheNotoriousMMADefinitely. twitter.com/RealDannyBrown…Danny Brown 🏴󠁧󠁢󠁷󠁬󠁳󠁿@RealDannyBrown@TheNotoriousMMA WW next?314299@TheNotoriousMMA WW next?Definitely. twitter.com/RealDannyBrown…'The Notorious' has been out of action since his infamous leg break at UFC 264. According to UFC President Dana White, the Irishman is eyeing an early 2023 return to the octagon.