Arsene Wenger's longstanding rivalry with Jose Mourinho (right) has added a new layer of intrigue to this weekend's clash between Arsenal and Manchester United at Old Trafford.
The United-Arsenal fixture lost some of its edge after Alex Ferguson's 2013 retirement, but Mourinho's predecessor Louis van Gaal did his best to add drama. The eccentric Dutchman fell to the floor in front of official Mike Dean and Wenger during the February 2016 clash at Old Trafford, mimicking an alleged dive by one of Arsenal's players.
Robin van Persie disappointed Arsenal fans when the club's captain made a controversial $37 million move to United in 2012. The Dutch striker then won his first Premier League title, while the London side finished a distant fourth.
Arsenal's 2011 trip to Old Trafford ended in one of Wenger's most humiliating defeats as United won 8-2, led by Wayne Rooney's sixth career hat-trick for the club.
The 2009 clash at Old Trafford created one of the most iconic images of this rivalry. Sent off by referee Mike Dean, Wenger makes his way to the stands behind the dugout. Without an obvious place to go, the Frenchman holds his arms out in Dean's direction, much to the delight of the United fans around him.
A year after his injury-time penalty crashed against the crossbar -- missing the opportunity to end Arsenal's "Invincibles" run in its infancy -- Ruud van Nistelrooy scored from the spot at Old Trafford in October 2004 to halt the Gunners' unbeaten streak at 49 games. On his knees and screaming into a microphone, this was one of the most cathartic goals in Premier League history.