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The Celtic League was initially the top-level league competition in Ireland, Scotland and Wales, with two Italian franchises later bolstering the numbers. The first season was contested by 15 sides in 2001-02, with the four Irish provinces being joined by Edinburgh and Glasgow and all nine Welsh Premiership sides. The competition was originally played alongside the Welsh-Scottish League and Irish Inter-Provincial Championship, a trend that only lasted for a single season with the Welsh-Scottish league abandoned and Irish Championship downgraded.

The league was originally contested over two groups, with semi-finals and a final deciding the winners.

In 2004, the league became the major domestic competition in all three countries, with the five Welsh regions (Cardiff Blues, Ospreys, Scarlets, Dragons and the now defunct Celtic Warriors) taking the place of sides from the Premiership. The league also embraced a traditional league structure for the first time.

Celtic Warriors were disbanded at the end of the 2004-05 season, and Scottish territory Border Reivers suffered the same fate at the end of the 2006-07 season. In the 2010-11 season, Benetton Treviso and Aironi were added to the mix, although Aironi lasted only two seasons before being disbanded and replaced by Zebre. A semi-final and final play-off system was re-introduced for the 2009-10 season.

Celtic League

Year Winners
2001-02 Leinster
2002-03 Munster
2003-04 Scarlets
2004-05 Ospreys
2005-06 Ulster

Magners League

Year Winners
2006-07 Ospreys
2007-08 Leinster
2008-09 Munster
2009-10 Ospreys
2010-11 Munster

Grand Finals

Year Date Score
2009-10 May 29, 2010 Leinster 12-17 Ospreys
2010-11 May 28, 2011 Munster 19-9 Leinster

RaboDirect PRO12 - Grand Finals

Year Date Score
2011-12 May 27, 2012 Leinster 30-31 Ospreys
2012-13 May 25, 2013 Ulster 18-24 Leinster

Live Scores
Results
Fixtures