Saracens had not suffered defeat since April, but they were soundly beaten by Exeter Chiefs to lose top spot in the Premiership.
Cobus Reinach and Luther Burrell scored intercept tries and Dan Biggar had a good outing at the tee in a comfortable win for Northampton.
The Dragons looked set to earn a draw despite playing for almost 50 minutes with a man down, but Cardiff Blues denied them right...
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Back-to-back wins over Newcastle Falcons have Edinburgh closing in on a quarter-final place in the European Champions Cup.
La Rochelle's perfect record in the Challenge Cup was ended by Bristol, but Clermont Auvergne claimed a fourth win out of four.
Saracens battled past Cardiff Blues to stay top of Pool 3, while Toulouse came out on top in an entertaining clash with Wasps.
Ulster and Exeter Chiefs enhanced their chances of qualifying for quarter-finals of tEurope's premier club rugby competition on Friday.
Tributes were paid to teenager Nicolas Chauvin before and after Stade Francais got the better of the Ospreys in Paris.
Premiership leaders Saracens made it three wins from three in the European Champions Cup after victory over Cardiff Blues on Sunday.
There were wins for the Ospreys, Sale Sharks and Clermont Auvergne in the European Challenge Cup on Saturday.
There were wins for Gloucester, Toulon and Leinster in the European Champions Cup on Saturday.
There were wins for Ulster and Edinburgh over the Scarlets and Newcastle Falcons in the European Champions Cup on Friday.
There were wins for Pau and Grenoble over Worcester Warriors and Agen respectively in the European Challenge Cup.
Clermont Auvergne's advantage at the top of the Top 14 table was cut to three points following Toulouse's victory on Sunday.
A low-scoring draw at Bath was enough to lift Sale Sharks back off the bottom of the table, although they were frustrated after leading.
Montpellier's late rally did not deny Top 14 leaders Clermont Auvergne a 28-23 victory, while Guilhem Guirado scored a try in Toulon's win.