Yesterday Conor McGregor celebrated the four year anniversary of his victory over Eddie Alvarez at UFC 205. That night—on November 12, 2016—McGregor made history by clinching the UFC lightweight belt and becoming the first fighter to simultaneously hold two UFC championship titles.
When McGregor beat Alvarez he was coming off his two-fight series with Nate Diaz, in which he lost the first bout (by submission at UFC 196 in March 2016) and won the second (by decision at UFC 202 in August 2016).
Those fights came a few months after McGregor beat Jose Aldo, via 13 second KO, to win the UFC featherweight crown.