The RaboDirect PRO12 has a dozen talented teams chasing the 4 elusive play-off spots.
The teams come from four nations Ireland, Italy, Scotland and Wales.
Benetton Treviso and Aironi Rugby joined the 12-team cross-border competition in 2010/11, the 10th season of the league.
The tournament consist of a 22 weekend league stage, when all twelve teams will play each other on a home and away basis, with the top four teams at the end of the season qualifying for the Play-Off semi-finals and final.
Italian Rabo Direct Pro12 club.Read more from Benetton Treviso
Irish provincial team playing in Rabo Direct Pro14.Read more from Connacht
Italian Rabo Direct Pro12 team.Read more from Zebre
Osprey were club created from Neath and Swansea (the latter being where the team now play) to compete at the top levels of domestic and european rugby.Read more from Ospreys