Bath have confirmed that Carl Fearns will leave the club to join French side Lyon.
Back-row Fearns, who has made 73 appearances for the West Country side, is renowned for his uncompromising style of play in both attack and defence.
"I've had a fantastic four years at Bath during what has been a great time for the club," said the 26-year-old.
"Whilst I'm sad to be leaving my team-mates and coaches here, I'm really looking forward to moving with my family to France and continuing my rugby career in a different environment."
Bath head coach, Mike Ford, said: "We're obviously disappointed to let Carl go, but he feels the time is right to make a change, and we respect that.
"He's a talented and committed player, and I'm sure he'll be a great success in France."