Arsene Wenger is coming to the end of his reign as Arsenal manager, and as much as that period is defined by early success and later failure, his rivalry with Manchester United has been a thread that has run through it all.
On Sunday, Wenger will take charge of an Arsenal side at Old Trafford for the last time before he leaves the club at the end of the current campaign. It is a venue that has seen victories, defeats and famous battles.
Sportsmail has taken a look at the good, bad and the ugly moments from Wenger's visits to Old Trafford since he took charge at Arsenal in 1996.
The Good
The 1997-98 title race: Manchester United had won four out of the previous five Premier League titles. In February 1998 they had a sizeable lead over Arsenal and bookmakers were paying out on them winning the title. But when Wenger's side visited Old Trafford in March, they were within reach. A Marc Overmars goal led to victory. Arsenal were just six points behind with three games in hand. They went on to win the title and, eventually the double.
Winning the 2001-02 Premier League: The following seasons were not ideal for Arsenal, with United once again taking charge of the English top flight.
But Alex Ferguson's retirement plans and subsequent back-track had a destabilising effect on the team. Arsenal hit form and ended up winning the title after beating United at Old Trafford in the second-to-last game of the season.
The 2005 FA Cup final: The two sides met in the 124th FA Cup final. The game was decided with a penalty shoot-out, the first time that had ever happened in the final of the famous trophy, with Arsenal winning 5-4.
The Bad
United regaining their domestic dominance: Arsenal may have won the league title in 1998 but they immediately ceded their crown. The Old Trafford side took the next two editions of the Premier League. And within there, there was a famous FA Cup semi-final defeat, inspired by Ryan Giggs, and a sorry 6-1 loss in February 2001.
The 2008-09 Champions League semi-finals: Arsenal had genuine hope going into the second-leg after only losing the first encounter at Old Trafford 1-0. But Ji-Sung Park scored for United within eight minutes, Cristiano Ronaldo struck a second in the 11th before doubling his tally on the hour. A Robin van Persie penalty was no more than a consolation.
Patrice Evra was blunt: 'It was 11 men against 11 children. We never doubted ourselves. We have much more experience and that's what made the difference.'
The 8-2 defeat at Old Trafford: It was the heaviest league defeat Arsenal had suffered in 84 years and the first time the club had conceded eight goals in a game since 1896. Arsenal were demolished by Manchester United amid a recruitment and injury crisis. The final score was 8-2, and Arsenal were never in the match from the off.
Robin van Persie leading United to the title: The Dutch forward had finally become the player Wenger had hoped he would be, but his contract was running out. While many expected him to move abroad, Van Persie instead switched to United. He would finish the season as top scorer — with 26 goals — as United eased their way to the title in Ferguson's last season.
And the Ugly
Feuding from the off: In the first league match following Wenger's arrival, there was an incident between Ian Wright and Peter Schmeichel. Wright challenged the goalkeeper with his studs while the striker accused Schmeichel of racial abuse.
They settled their differences, but when Wenger commented on United's fixture congestion, Ferguson replied curtly.
'Maybe he should concentrate on Ian Wright's tackles rather than Manchester United,' the Scot said. 'He's at a big club, well Arsenal used to be a big club, and maybe next year he could be in the same situation. I wonder what [h]is story will be then.'
Bid for Patrick Vieira: Ferguson announced he would retire in summer 2001 but also sanctioned a move for Vieira. The midfielder was not happy at inactivity in the market from Arsenal.
A move never happened and Wenger would blame United for '...approach[ing] to Patrick without contacting us, and that does not really respect the rules.'
The Battle of Old Trafford: In September 2003, Arsenal travelled to Old Trafford. Vieira was sent off. Martin Keown gave away a penalty in stoppage time. Ruud van Nistelrooy stepped up to take it but hit the crossbar.
Arsenal players then surrounded the Dutchman and there was another fracas. Six Arsenal players were charged by the FA and the club was fined £175,000, the largest given to a club by the FA at that point.
Pizzagate: Arsenal were the Invincibles, and went into a match at Old Trafford on October 24, 2004 with a 49-match unbeaten run to their name. Ferguson ramped up the tension by calling Arsenal's behaviour the year prior 'the worst thing I've seen in this sport'. Arsenal were on top but United earned a penalty when Wayne Rooney was fouled.
Van Nistelrooy scored it before Rooney doubled their lead later in the game. After the final whistle, Wenger confronted Van Nistelrooy for a tackle on Ashley Cole. Ferguson intervened and then had pizza thrown at him by an Arsenal player, later revealed to be Cesc Fabregas. He said last year: ‘I was like, I want to get in, but I don’t know how to and I threw... peeew... just threw (the pizza). Once I saw it was hitting, like, who it was hitting, which I didn’t mean...’
Keane and Vieira: In the reverse Premier League fixture from the same year, captains Roy Keane and Patrick Vieira had to be held apart in the tunnel before the game by referee Graham Poll. Keane thought Vieira was trying to intimidate Gary Neville.
After the game, he revealed: 'I said, "Come and have a go at me". Simple as that. If he wants to intimidate some of my team-mates then let's have a go at some of the other players. I think Gary Neville's an easy target. I wasn't having it.'
