Question: Robert Douglas was part of the team that reached the 2003 UEFA Cup final under the manager from what country?

Context paragraphs:
2003 UEFA Super Cup: The 2003 UEFA Super Cup was played on 29 August 2003 between Milan of Italy and Porto of Portugal.  Milan qualified by beating Juventus in the 2003 UEFA Champions League Final.  Porto had made it to the Super Cup after beating Celtic in the 2003 UEFA Cup Final.  Milan won the match 1–0.  After the match, defeated Porto manager José Mourinho said "We leave here convinced we can go into the UEFA Champions League with the hope and certainty we can compete with any team".  They finished the season as UEFA Champions League winner.

Sport in Manchester: Manchester City and Manchester United are popular Premier League football clubs in Manchester, United's ground is in Old Trafford, and fixtures between the clubs are referred to as the Manchester Derby.  In 2012, City finished first and United second in the Premier League.  Manchester has hosted every major domestic, continental and international football competition, including the World Cup in 1966, the European Championship in 1996, Olympic Football in 2012, the 2003 UEFA Champions League Final, the 2008 UEFA Cup Final, 1893, 1911, 1915 and 1970 FA Cup Finals and 1977, 1978 and 1984 Football League Cup Final.

2001 UEFA Cup Final: The 2001 UEFA Cup Final was a football match between Liverpool of England and Alavés of Spain on 16 May 2001 at the Westfalenstadion in Dortmund, Germany.  The showpiece event was the final match of the 2000–01 edition of Europe's secondary cup competition, the UEFA Cup.  Liverpool were appearing in their third UEFA Cup final, after their appearances in 1973 and 1976.  It also represented the first European final they reached since being banned from Europe following the Heysel Stadium disaster.  Alavés were appearing in their first European final.

2009 UEFA Cup Final: The 2009 UEFA Cup Final was the final match of the 2008–09 UEFA Cup, the 38th season of the UEFA Cup, UEFA's second-tier club football tournament.  It was also the last final to be held under the UEFA Cup name, as the competition was rebranded as the UEFA Europa League from the 2009–10 season.  The match was contested by Shakhtar Donetsk and Werder Bremen; Shakhtar won the match 2–1 after extra time.  Lone striker Luiz Adriano opened the scoring for Shakhtar midway through the first half, before Naldo equalised from a free kick ten minutes later.  The second half was goalless and the match went to extra time; after only seven minutes, Jádson scored for Shakhtar to secure the club's first major European trophy.

Robert Douglas (footballer): Robert James Douglas (born 24 April 1972 in Lanark) is a Scottish former footballer, who played as a goalkeeper.  Douglas played for several clubs, including Livingston, Dundee, Celtic, Leicester City and Forfar Athletic.  Douglas was part of the Celtic side that reached the 2003 UEFA Cup Final, under the management of Martin O'Neill.  He also represented Scotland at international level, playing 19 times between 2002 and 2005.

2000 UEFA Cup Final: The 2000 UEFA Cup Final was a football match that took place on 17 May 2000 at Parken Stadium in Copenhagen, Denmark to decide the winner of the 1999–2000 UEFA Cup.  The game event pitted Galatasaray of Turkey and Arsenal of England, and was the final match of the 1999–2000 season, the 29th final of Europe's second largest club football competition, the UEFA Cup.  It was Galatasaray's first appearance, in a final of a European tournament and Arsenal's first UEFA Cup final.

2002 UEFA Cup Final: The 2002 UEFA Cup Final was a football match played on 8 May 2002, between Feyenoord of the Netherlands and Borussia Dortmund of Germany.  Feyenoord won the match 3–2.  It was the 31st UEFA Cup Final and was held in the Feijenoord Stadion in Rotterdam, which is the home ground of Feyenoord.  This was the first time since the introduction of single–match finals in the UEFA Cup in 1998, that the final had been played at a finalists home ground.  Previous to this match, Feyenoord had not won a European trophy since 1974, when they beat Tottenham Hotspur to win the UEFA Cup.  Borussia Dortmund, who had already won the Bundesliga title, were hoping to join Ajax, Bayern Munich and Juventus in being the only clubs to win all three European trophies.  Feyenoord's victory marked the first European triumph for a Dutch club in seven years, after Ajax won the Champions League in 1995.

The Bhoys from Seville: The Bhoys from Seville is a nickname used to refer to Celtic F.C.'s team and fans during Celtic's 2002–03 UEFA Cup campaign, which culminated in their defeat in the 2003 UEFA Cup Final against F.C. Porto in Seville, Spain.  Around 80,000 Celtic fans travelled to support their team in the final.  The name "The Bhoys from Seville" is a play on words from the book and film "The Boys from Brazil", the nickname of Celtic F.C. (The Bhoys), and the location of the final (Seville).  This UEFA Cup campaign was Celtic's most successful in Europe since their run to European Cup Final in 1970, and the first time in 23 years that they had remained in European competition beyond Christmas.

1995 UEFA Cup Winners' Cup Final: The 1995 UEFA Cup Winners' Cup Final was a football match on 10 May 1995 contested between cup holders Arsenal of England and Real Zaragoza of Spain.  The final was held at Parc des Princes in Paris.  It was the final match of the 1994–95 UEFA Cup Winners' Cup and the 35th UEFA Cup Winners' Cup Final.  Real Zaragoza won the match 2–1 after extra time, preventing Arsenal from retaining the trophy that they had won in 1994.

Martin O'Neill: Martin Hugh Michael O'Neill OBE (born 1 March 1952) is a professional football manager, from Northern Ireland, who is manager of the Republic of Ireland national team.

Supporting paragraphs: Robert Douglas (footballer) Martin O'Neill
Answer: Northern Ireland