Saints secure home advantage
Northampton secured a home tie in the quarter-finals of the Heineken Cup with a comfortable 23-12 victory over an under-strength Castres at Stade Pierre-Antoine.
Tries from man-of-the-match Joe Ansbro, Phil Dowson and Ben Foden ensured the Saints go through to the knock-out stage as one of the top four seeds, as well as recording a 100% record in Pool One - the first English team to do so since Bath in 2002.
No team, however, has ever won the competition - or even reached the final - after winning all their group games.
Castres put up a brave fight, with tries from Pierre Bernard and Sebastien Tillous-Borde, but it was not enough to protect their unbeaten home record.