Conor McGregor has been a bjj brown belt since 2014. He was awarded the promotion after defeating Poirier
In 2016 he still didn't know how to tie his belt:
However before he was an international sensation, and before he was even a purple belt just trying to win IBJJF matches he was grappling in backwoods competitions.
Here's the earliest Conor McGregor grappling footage that recently resurfaced:
