One year ago today, the most anticipated featherweight bout of all time took place in Las Vegas. 13 seconds later, it was all over.

Conor McGregor’s one-punch victory over the man who had ruled the featherweight division for the best part of decade was the most decisive title win in the history of the sport. The year-long build up, the world tours, the belt-grab in Dublin — all of those moments fed into the atmosphere inside the MGM Grand Garden Arena that night.

And with one swing of his left hand, McGregor won the UFC Featherweight title and set into motion a series of events which culminated in the Irishman becoming the first simultaneous two-division champion in UFC history — an accomplishment none of McGregor’s peers can claim.

#OnThisDay in 2015: @TheNotoriousMMA backed it all up against Jose Aldo…

📽 https://t.co/RmGWL0cwN2 pic.twitter.com/HcuVKkaNKD

— UFC Europe (@UFCEurope) December 12, 2016

You can relive that historic moment in the video clip above.