Republic of Ireland manager Martin O'Neill and assistant Roy Keane have left their jobs by mutual agreement, the Football Association of Ireland has said.
O'Neill, who took over in November 2013, was in charge for 55 games but had endured a disappointing run of results in 2018.
The Republic finished last in their Nations League group and have won only one of their last 11 games, with reports after Monday's goalless draw with Denmark suggesting the manager's future was in doubt.
Former Republic and Manchester United midfielder Keane, goalkeeping coach Seamus McDonagh and assistant coach Steve Guppy have all left their posts.
O'Neill guided the Republic to qualification for the 2016 European Championship, where they reached the round of 16, while they lost in the qualifying playoffs for this year's World Cup.
"On behalf of the FAI board, I would like to thank Martin, Roy, and the management team for their work with the Republic of Ireland team over the last five years," FAI president Donal Conway said.
"Martin ensured that we enjoyed some great nights in the Aviva Stadium and on the road in Lille, Vienna, and Cardiff, which were fantastic high points for Irish football."
The organisation's chief executive John Delaney said: "There have been many highlights during Martin's reign -- none more so than Euro 2016 in France, which will live long in the memory of all Irish supporters.
"Martin did a great job guiding the team out of a difficult qualifying group, where we beat world champions Germany along the way, to reach Euro 2016 and advance to the last 16.
"I wish Martin, and the management team, the very best for the future."
The FAI said its board would begin discussions over the appointment of a new manager as soon as possible.