South Wales League
It ran between 1891 and 1911, closing down in September 1911 before the start of the planned 1911–12 season.Treharris were the first champions after a disorganised first season which was concluded by the top three clubs playing off for the championship.The next three seasons were affected by unplayed matches; and at the completion of the 1893–94 season, the management committee announced the winding up of the league.For the next two seasons, the league trophy was played for as a junior cup competition.The league restarted for the 1896–97 season and grew in numbers, eventually adding a second division, which operated without promotion or relegation.