The league was founded in 1891 and was contested every season until 2017, with the exception of the two World Wars.
Clubs competed in three cup competitions, the MacMillan Bowl, the R T Raine Trophy and the Lou Moore Memorial Trophy.
The R T Raine Trophy is competed by the League Champions and MacMillan Bowl winners from the previous season.
[2] The final season's championship was contested by 13 teams, though 14 were originally listed.
[2] The division was reduced from 16 teams from the previous season.