Celtic and manager Ronny Deila have announced that they are to part at the end of the season.
The 40-year-old Deila arrived in June 2014 having won the Norwegian championship with Stromsgodset in his homeland.
In his first season, he led Celtic to a fourth consecutive league title and lifted the Scottish League Cup with a 2-0 victory over Dundee United.
A second title under Deila seems certain as they lead the Scottish Premiership by eight points from Aberdeen.
But they failed to reach the Champions League group stage in both seasons and, this term, finished bottom of their Europa League group and were knocked out in the semi-finals of both domestic cup competitions.
6 June 2014: Ronny Deila appointed Celtic manager
15 July 2014: First competitive game as manager, beats KR Reykjavik of of Iceland 1-0 in a Champions League qualifier. Celtic go on to win the tie 5-0 on aggregate.
30 July 2014: Celtic lose 4-1 to Legia Warsaw and fail to overturn the deficit with another 2-0 defeat in the second leg at Murrayfield. However, they are given a 3-0 win and a place in the next round after Legia Warsaw are found to have fielded an ineligible player.
26 August 2014: Celtic crash out of the Champions League qualifiers with a 2-1 aggregate defeat by Maribor of Slovenia.
5 October 2014: After a 1-0 home defeat by Hamilton Academical, Celtic find themselves as low as sixth in the Scottish Premiership.
9 November 2014: The "Ronny Roar" makes its first appearance after Celtic come from behind to beat Aberdeen at Pittodrie, with Virgil van Dijk scoring a last-minute winner. Celtic go top of the league.
1 February 2015: The Old Firm meet at Hampden Park in the League Cup semi-final, with first-half goals from Leigh Griffiths and Kris Commons settling the tie in Celtic's favour.
26 February 2015: Celtic make it as far as the last 16 of the Europa League but lose 4-3 on aggregate to Inter Milan, with Virgil van Dijk red-carded in the San Siro.
1 March 2015: Celtic end Aberdeen's 13-game unbeaten run and go six points clear at the top of the table with a game in hand following a 4-0 win over Derek McInnes men.
15 March 2015: Deila wins his first trophy as manager of Celtic with a 2-0 win over Dundee United in the League Cup final.
19 April 2015: Celtic's dreams of a domestic treble are ended in the Scottish Cup semi-final by eventual winners Inverness Caledonian Thistle, who win 3-2 after extra-time.
2 May 2015: Deila's side are crowned champions after Aberdeen lose 1-0 to Dundee United.
25 August 2015: Celtic defeat Starnan and Qarabag in the Champions League qualifiers but fail again to make it to the group stages, this time losing 4-3 on aggregate to Malmo of Sweden.
12 September 2015: After a 2-1 win over Celtic at Pittodrie by 10-man Aberdeen, the Dons leapfrog Deila's side and go top of the Premiership.
22 October 2015: Deila describes Kris Commons' reaction to being substituted in a 3-1 defeat by Molde as "unacceptable" and "disrespectful". The midfielder berated the Celtic back-room staff in the dugout.
10 December 2015: A 1-1 draw with Fenerbahce ends Celtic's involvement in the Europa League, with the Glasgow club finishing bottom of their group behind the Turks, Ajax and Molde.
31 January 2016: Celtic lose 3-1 to Ross County at Hampden in the League Cup semi-final to again end dreams of a domestic treble.
3 February 2016: Days after the Hampden defeat, Celtic lose 2-1 to Aberdeen.
19 March 2016: After dropping the "Ronny Roar", it re-appears as a Tom Rogic last-minute winner away to Kilmarnock puts Celtic five points clear in the title race.
9 April 2016: A 2-1 win over Motherwell puts Celtic eight points clear at the top of the league with five games remaining.
17 April 2016: Glasgow rivals Rangers, who have won the Championship title, beat Celtic 5-4 on penalties after a 2-2 draw to knock them out of the Scottish Cup.
20 April 2016: Celtic announce on their website that Deila has decided to leave the club at the end of the season.