2009–10 Celtic League
The 2009–10 Celtic League (known as the 2009–10 Magners League for sponsorship reasons) was the ninth season of the league now known as Pro12 and the fourth with Magners as title sponsor. The season began in September 2009 and ended with the Grand Final on 29 May 2010. Ten teams played each other on a home-and-away basis, with teams earning four points for a win, two points for a draw and a bonus point for scoring four or more tries in a match. The losing team may also earn a bonus point if they lose by seven points or less.