A sextuple champion in boxing refers to a boxer who has won world titles in six different categories of weight.
There is some dispute on which sanctioning body is considered "major" enough to award championships. The "Big 4" sanctioning bodies are always included. They are arranged in order of foundation:
The Ring, boxing's most respected magazine that was founded in 1922, has its own version of lineal championship and began awarding championship belts in 1922. The Lineal Champion is also known as the true champion of the division. The Ring Champion holds the linear reign to the throne, the man who beat the man. The Ring stopped giving belts to world champions in the 1990s but began again in 2002.