Came across this today and its pretty cool to read about the history of the Linear Middleweight championship, must mean a lot to Pavlik to hold on to something like that:
In 1987 "Sugar" Ray Leonard defeated "Marvelous" Marvin Hagler for the WBC title but also for the Linear, Universally Recognized Middleweight Championship. Leonard vacated the WBC title leaving the division fragmented until 2001 when IBF & WBC Champion Bernard Hopkins defeated WBA Champion Felix Trinidad. Hopkins became Undisputed and the first Universally Recognized Middleweight Champion since "Sugar" Ray leonard vacated the Crown in 1987. Hopkins went on to defeat Oscar De La Hoya in 2004 for the WBO Title and became the first person to ever unify all 4 of the major world titles in any weight class. Bernard Hopkins lost all of his Titles and the Linear Championship to Jermain Taylor in 2005. Over the next two years Taylor was stripped of 2 belts but successfully defended the Linear Championship until he was Defeated decisively by Kelly Pavlik on September 29, 2007. Kelly Pavlik holds the WBC & WBO Titles along with recognition from The Ring Magazine as the best Middleweight on the the Planet. Pavlik also inherits the direct legitimate lineage of the Middleweight Championship dating back to Leonard, Hagler, Griffith, Fullmer, Graziano, LaMotta, Robinson, Greb, Ketchel and Fitzsimmons.