Conor McGregor won championships.
Conor McGregor . He is the reigning UFC Lightweight Champion , and former UFC Featherweight Champion . In 2008 , McGregor started his mixed martial arts ( MMA ) career and , in 2012 , he won both the Cage Warriors Featherweight and Lightweight Championships , holding both titles concurrently before vacating them to sign with the UFC . In 2015 , at UFC 194 , McGregor defeated José Aldo for the UFC Featherweight Championship via knockout thirteen seconds into the first round . Upon defeating Eddie Alvarez for the UFC Lightweight Championship at UFC 205 , McGregor became the first fighter in UFC history to hold titles in two weight divisions simultaneously .