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| 2001–2006 | 2006–2011 | 2011–2014 | 2014–2017 | 2017–2021 | 2021–present |
Celtic League[]
2001–2006[]
The Celtic League was founded in 2001, featuring rugby union clubs from Scotland, Wales and Southern and Northern Ireland.
Magners League[]
2006–2011[]
Magners became title sponsors of the Celtic League in 2006. In 2010-11, Italian teams joined for the first time.
RaboDirect Pro12[]
2011–2014[]
In 2011, it was announced that Rabobank had bought the sponsorship, using their RaboDirect brand as a title sponsor. The Pro12 name represented the number of teams in the league.
Guinness Pro12[]
2014–2017[]
Guinness became the new sponsors of the Pro12 on 10 July 2014.
- Pro12: Guinness named as league's new sponsor - BBC Sport, July 10, 2014
Guinness Pro14[]
2017–2021[]
The 2017 addition of two South African teams (Cheetahs and Southern Kings) brought the club count up to 14, and the competition was renamed accordingly.
United Rugby Championship[]
2021–present[]
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External links[]
United Rugby Championship
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| Current clubs: Benetton | Bulls | Cardiff | Connacht | Dragons | Edinburgh | Glasgow Warriors | Leinster | Lions | Munster | Ospreys | Scarlets | Sharks | Stormers | Ulster | Zebre Parma Former clubs:  |