Who reigned for 50 months as lineal champion  and fought Richard Williams?
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. Richard Williams is trained by Brian Lawrence, and managed by Barry Hearn, and John Rooney.
Dave Sullivan (boxer) Dave Sullivan (May 10, 1877 – 1929) was an Irish-American boxer who took the World Featherweight Title on September 26, 1898 in a controversial bout against Solly Smith, in Brooklyn, New York on a fifth-round technical knockout, three rounds after Smith had broken his arm. He would hold the title only forty-six days before losing it to the legendary Black champion George Dixon. Dan Donelly was a corner man and may have acted as his trainer.