Jens Pulver (2001-02) defeated Caol Uno at UFC 30 (02/23/01) to win the UFC Lightweight Championship. https://ufcfightpass.com/video/29364 Pulver defends his title against Dennis Hallman and BJ Penn before leaving the organization and canceling the title. In 2002-03, a four-player tournament starring BJ Penn, Caol Uno, Matt Serra and Din Thomas was held to determine a new champion, but the title remained vacant after a five-round draw between Penn and Uno in the last game at UFC 41. The division was then used sporadically until the UFC 49 fight between Yves Edwards and Josh Thomson in 2004. The division did not return until UFC 58 in 2006.
Sean Sherk (2006-07) defeated Kenny Florian at UFC 64 (10/14/06) to win the vacant lightweight UFC title. https://ufcfightpass.com/video/30063 Defends the title against Hermes Franca but is then stripped of the belt after being tested positive for steroids.
BJ Penn (2008-10) defeated Joe Stevenson in the second round at UFC 80 (19/01/08) to win the vacant UFC crown. https://ufcfightpass.com/video/28860 Penn successfully defended his title against Sherk, Florian and Diego Sanchez.