Over the years, several champions have left a lasting mark in MMA.Choosing the greatest lightweight champion is never easy. Here is a look at the five greatest UFC lightweight champions who helped shape one of the promotion’s most exciting divisions.No fighter ruled the lightweight division quite like Khabib Nurmagomedov. Khabib captured the vacant lightweight title before defending it against Conor McGregor, Dustin Poirier, and Justin Gaethje. Since winning the lightweight title, Makhachev has mixed sharp striking with elite wrestling to become one of the most complete fighters in the sport. Penn, one of the true pioneers of the lightweight division.