The Championship originated in 1999 when the Welsh and Scottish unions created a competition for their teams, and in 2001 four Irish provinces were added to create the Celtic League. The ambition amongst the three unions in 2001 was to create a vibrant and competitive professional club competition that would provide their players with the best preparation for Test level rugby. In 2010, two Italian teams were welcomed as the competition began to look boldly towards a more diverse future – this was reflected in the name change to PRO12 in later seasons. In a historic move in 2017, the Championship expanded to South Africa and, in keeping with its cross-border DNA, added the Cheetahs and the Southern Kings to become a cross-hemisphere club rugby tournament known as the PRO14.