A quadruple champion in boxing refers to a boxer who has won world titles in four different categories of weight.
It echoed many critics' arguments that the sanctioning bodies in charge of boxing championships had undermined the sport by pitting undeserving contenders against undeserving "champions", and forcing the boxing public to see mismatches for so-called "world championships".
In May 2012, citing the number of vacancies in various weight classes as primary motivation, The Ring unveiled a new championship policy.
The Transnational Boxing Rankings Board (TBRB) hands out the official version of the lineal championship.
The Board was formed to continue where The Ring "left off" in the aftermath of its purchase by Golden Boy Promotions in 2007 and the following dismissal of Nigel Collins.
After the new editors announced a controversial new championship policy in May 2012, three prominent members of the Ring Advisory Panel resigned.
Note: This list is credited for boxers who have won championships in boxing from major sanctioning bodies (WBA, WBC, IBF, WBO), The Ring.
In the entire history of boxing, only Manny Pacquiao has successfully conquered four divisions in the original eight weight classes.