Question: Who reigned for 50 months as lineal champion  and fought Richard Williams?
Sentence (from "Richard Williams (boxer)"): Richard "The Secret" Williams ( (1971--) 09 1971 (age (2017)-(1971)-((11)<(05)or(11)==(05)and(30)<(09)) ) is an English professional light middle/middle/super middleweight boxer of the 1990s, 2000s and 2010s who won the International Boxing Organization (IBO) light middleweight title, and Commonwealth light middleweight title (twice), and was a challenger for the International Boxing Organization (IBO) light middleweight title against Sergio Gabriel Martinez, and British Boxing Board of Control (BBBofC) British middleweight title against Howard Eastman, his professional fighting weight varied from 149+3/4 lb , i.e. light middleweight to 162+1/4 lb , i.e. super middleweight.
Relevant evidence: Yes