UFC started in 1993 without sanctioning and weight classes. Weight classes introduced in 1997 with two divisions: heavyweight and lightweight. New Jersey's 2000 MMA regulations unified UFC's weight classes in 2001
Born in 1981 in Quebec, St-Pierre started martial arts at age 7. Trained in wrestling, BJJ, Muay Thai, and submission fighting. Worked as bouncer and garbageman before becoming professional
Born in 1993, started martial arts training at age seven. Grew from 5'8" to 6'5" due to intense growing pains. Won British Open in Brazilian jiu-jitsu except black belt
Born in Honolulu in 1991 to drug-using parents. Started kickboxing at age 15, winning first amateur bout. Graduated from Waianae High School in 2010
UFC introduced weight-specific titles in 1997 with UFC 12. By UFC 31, there were five active weight divisions. Featherweight and Bantamweight divisions added in 2010. Currently 12 weight classes: eight men's and four women's
UFC rankings introduced in 2013 by media voting panel. Rankings based on weight class and pound-for-pound performance