Kuwaiti-owned Nottingham Forest revealed on Thursday that Billy Davies has returned to the English second-tier club as manager.
Davies, 48, was fired in June 2011 following a previous spell in charge at the City Ground, but returns to succeed Alex McLeish, who left the club by mutual consent on Monday after only 40 days at the helm.
"I'm delighted to welcome Billy back to our club and really look forward to working closely with him," chairman Fawaz Al Hasawi told the Championship club's official website.
"Billy has unfinished business with the Reds and we know how hungry he is for success. In returning to the City Ground, we believe his leadership will help us fulfil our ambition of making it to the Premier League.
"Billy is a Forest legend who needs no introduction to our loyal fans. We know how excited he is to pick up where he left off last time and we will back him 110 percent. This is a very exciting appointment for us."
McLeish parted company with Forest after his first seven games yielded one win, one draw and five defeats, although he left the club only six points below the play-off places.
Forest twice lifted the European Cup, in 1979 and 1980, under legendary manager Brian Clough, having won the old First Division title in 1978, but they have not played in the Premier League since 1999.
The Al Hasawi family, who took over the club at the start of the season, have now worked with three different coaches since taking charge, having also sacked Sean O'Driscoll at the end of December.