Ospreys fly-half Matthew Morgan has become one of seven players to sign for Bristol for next season.
The 21-year-old has played 65 games for the Pro 12 club since his 2010 debut.
Championship leaders Bristol have also announced the permanent signing of 25-year-old Bath flanker Nick Koster.
Meanwhile, prop Jack O'Connell and winger Darren Hudson arrive from Leinster, alongside Harlequins hooker Max Crumpton, Samoa back-rower Jack Lam and Leeds scrum-half Craig Hampson.
All seven players have signed two-year deals with Andy Robinson's side, who are five points clear at the top of the English second tier.
O'Connell has made 13 appearances for Leinster in the Pro12 since his debut in 2011, while team-mate Hudson, also 23, has made played one more game and scored three tries.
Capped four times for Samoa, 26-year-old Lam arrives from Super Rugby side Hurricanes and joins fellow countrymen David Lemi and Anthony Perenise at Bristol.
Crumpton, 20, played for England at the IRB Junior World Championships in 2012 and has previously played in the Championship with Plymouth Albion.
Since graduating through Leeds' academy, Hampson, 24, has made 62 first-team appearances for the Headingley outfit, scoring nine tries.
Koster joined Bristol on loan at the start of the season and has impressed enough to earn a permanent move.