Gary Johnson has left Bristol City by mutual consent following a disappointing run of form.
The Robins have registered just two wins in their last 12 Coca-Cola Championship games and are seven points above the relegation zone.
The 54-year-old took charge at Ashton Gate in 2005 and won promotion to the Championship two years later before taking them to within 90 minutes of a place in the Barclays Premier League. However, their dreams were ended by a 1-0 defeat to Hull at Wembley.
Johnson presided over 239 games, winning 96, drawing 69 and losing 74, the last of which came courtesy of their last-gasp 3-2 reverse at relegation-threatened Plymouth on Tuesday night.
Johnson's assistant Keith Millen will take charge of Saturday's visit of Newcastle.