Answer
Mosley held the lineal welterweight championship twice during his boxing career. His first reign began in 2000 when he defeated Oscar De La Hoya, and he successfully defended the title against Fernando Vargas before losing it to Vernon Forrest in 2002. Mosley regained the lineal championship in 2003 after defeating Winky Wright and held it until 2004 when he lost to Shane Mosley.