Shane Geraghty will rejoin London Irish this summer after signing a two-year deal with the club he left in 2009.
Geraghty angered Exiles coach Toby Booth when he decided to leave London Irish for Northampton. The 25-year-old had graduated from the London Irish academy and Booth said the club were "not prepared to be held over a barrel in terms of financial demands".
London Irish director of rugby Brian Smith said: "We're looking forward to welcoming him back into the fold."
The former England attack coach is excited by the prospect of Geraghty playing outside Ireland international scrum-half Tomas O'Leary, who is joining the club from Munster in the summer.
"I know Shane well and he is an exceptional player with a great deal of skill," added Smith, who also returned to the club this year.
"He's a game-breaking ball player and he's matured as a game controller. As we're a team that wants to attack, Shane is a great player to partner Tomas O'Leary.
"His contribution during his first spell with London Irish was massive and I know he will contribute the same when he joins us again."
Geraghty won all of his six England caps while at London Irish, for whom he scored 219 points in 71 first-team appearances before leaving for Franklin's Gardens.
Booth felt let down by Geraghty's decision. He said at the time: "It's always disappointing when a homegrown player decides to leave for non-playing reasons given the resources the club has invested in developing him."
Geraghty failed to nail down a regular place in the Northampton starting line-up and he moved to Brive last summer, where he has helped the Top 14 club into the Amlin Challenge Cup semi-finals.