Question: When was the league whose trophy an undefeated Arsenal team won in the 2003-2004 season established?

full_context: Document 1: Arsenal F.C.: The return of former player George Graham as manager in 1986 brought a third period of glory. Arsenal won the League Cup in 1987, Graham's first season in charge. This was followed by a League title win in 1988–89, won with a last-minute goal in the final game of the season against fellow title challengers Liverpool. Graham's Arsenal won another title in 1990–91, losing only one match, won the FA Cup and League Cup double in 1993, and a second European trophy, the European Cup Winners' Cup, in 1994. Graham's reputation was tarnished when he was found to have taken kickbacks from agent Rune Hauge for signing certain players, and he was dismissed in 1995. His replacement, Bruce Rioch, lasted for only one season, leaving the club after a dispute with the board of directors.
Document 2: Premier League: Premier League Founded 20 February 1992; 26 years ago (1992 - 02 - 20) Country England (19 teams) Other club (s) from Wales (1 team) Confederation UEFA Number of teams 20 Level on pyramid Relegation to EFL Championship Domestic cup (s) FA Cup FA Community Shield League cup (s) EFL Cup International cup (s) UEFA Champions League UEFA Europa League Current champions Manchester City (3rd title) (2017 -- 18) Most championships Manchester United (13 titles) Most appearances Gareth Barry (653) Top goalscorer Alan Shearer (260 goals) TV partners Sky Sports and BT Sport (live matches) Sky Sports and BBC (highlights) Website premierleague.com 2018 -- 19 Premier League
Document 3: Arsenal F.C.: Arsenal finished in either first or second place in the league in eight of Wenger's first eleven seasons at the club, although on no occasion were they able to retain the title. As of July 2013, they were one of only five teams, the others being Manchester United, Blackburn Rovers, Chelsea, and Manchester City, to have won the Premier League since its formation in 1992. Arsenal had never progressed beyond the quarter-finals of the Champions League until 2005–06; in that season they became the first club from London in the competition's fifty-year history to reach the final, in which they were beaten 2–1 by Barcelona. In July 2006, they moved into the Emirates Stadium, after 93 years at Highbury.
Document 4: Everton F.C.: Neville Southall holds the record for the most Everton appearances, having played 751 first-team matches between 1981 and 1997, and previously held the record for the most league clean sheets during a season (15). During the 2008–09 season, this record was beaten by American goalkeeper Tim Howard (17). The late centre half and former captain Brian Labone comes second, having played 534 times. The longest serving player is Goalkeeper Ted Sagar who played for 23 years between 1929 and 1953, both sides of the Second World War, making a total of 495 appearances. The club's top goalscorer, with 383 goals in all competitions, is Dixie Dean; the second-highest goalscorer is Graeme Sharp with 159. Dean still holds the English national record of most goals in a season, with 60.
Document 5: List of English football champions: Manchester United have won 20 titles, the most of any club. United's rivals Liverpool are second with 18. Liverpool dominated during the 1970s and 1980s, while United dominated in the 1990s and 2000s under Sir Alex Ferguson. Arsenal are third; their 13 titles all came after 1930. Everton (nine) have enjoyed success throughout their history, and both Aston Villa (seven) and Sunderland (six) secured the majority of their titles before World War I. Huddersfield Town in 1924 -- 26, Arsenal in 1933 -- 35, Liverpool in 1982 -- 84 and Manchester United in 1999 -- 2001 and 2007 -- 09 are the only sides to have won the League title in three consecutive seasons.
Document 6: Arsenal F.C.: Arsenal Football Club is a professional football club based in Islington, London, England, that plays in the Premier League, the top flight of English football. The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup. It is also the only English club to go a 38 - match league season unbeaten, receiving the nickname The Invincibles, and a special gold Premier League trophy.
Document 7: Everton F.C.: Everton hold the record for the most seasons in England's top tier (Division One/Premier League), at 111 seasons out of 114 as of 2014–15 (the club played in Division 2 in 1930–31 and from 1951–54). They are one of seven teams to have played all 22 seasons of the Premier League since its inception in August 1992 – the others being Arsenal, Aston Villa, Chelsea, Liverpool, Manchester United, and Tottenham Hotspur. Everton against Aston Villa is the most played fixture in England's top flight, as of the 2012–13 season the two founder members of the Football League have played a record 196 league games.
Document 8: Everton F.C.: Everton were founder members of the Premier League in 1992, but struggled to find the right manager. Howard Kendall had returned in 1990 but could not repeat his previous success, while his successor, Mike Walker, was statistically the least successful Everton manager to date. When former Everton player Joe Royle took over in 1994 the club's form started to improve; his first game in charge was a 2–0 victory over derby rivals Liverpool. Royle dragged Everton clear of relegation, leading the club to the FA Cup for the fifth time in its history, defeating Manchester United 1–0 in the final.
Document 9: Everton F.C.: Formed in 1878, Everton were founding members of The Football League in 1888 and won their first League Championship two seasons later. Following four League Championship and two FA Cup wins, Everton experienced a lull in the immediate post World War Two period, until a revival in the 1960s, which saw the club win two League Championships and an FA Cup. The mid-1980s represented their most recent period of sustained success, with two League Championships, an FA Cup, and the 1985 European Cup Winners' Cup. The club's most recent major trophy was the 1995 FA Cup.
Document 10: List of football clubs in England by competitive honours won: England's first football competition, the FA Cup, began in the 1871 -- 72 season, making it the oldest football competition in the world. Arsenal hold the record number of wins, with 13. League football began in the next decade with the founding of The Football League in 1888 -- 89. The name First Division was adopted in 1892, when The Football League gained a second division. The First Division remained the highest division of the English football league system until 1992, when the Premier League was founded. Manchester United have won the most top division titles, with 20. The English equivalent of the super cup began in 1898 with the inauguration of the Sheriff of London Charity Shield, pitting the best professional and amateur sides of the year against each other. The trophy would develop into the FA Charity Shield in 1908, which was later renamed the FA Community Shield in 2002. Manchester United hold the record in the competition with 21 wins. The Football League created its own knockout competition in 1960, the League Cup. The Anglo - Italian League Cup was created in 1969 to match English cup winners against the winners of the Coppa Italia, and was permanently disbanded in 1976. In 1985, the Full Members Cup and Football League Super Cup were created as substitutes for UEFA competitions after UEFA responded to the Heysel Stadium disaster by banning English clubs. They finished in 1986 and 1992 respectively. The Football League Centenary Trophy marked The Football League's 100th birthday, in the 1988 -- 89 season.
Document 11: Arsène Wenger: Arsène Charles Ernest Wenger  (French pronunciation: ​[aʁsɛn vɛŋɡɛʁ]; born 22 October 1949) is a French football manager and former player. He was the manager of Arsenal from 1996 to 2018, where he was the longest-serving and most successful in the club's history. His contribution to English football through changes to scouting, players' training and diet regimens revitalised Arsenal and aided the globalisation of the sport in the 21st century.
Document 12: Premier League Manager of the Season: Season Manager Nationality Club Ref 1993 -- 94 Ferguson, Alex Alex Ferguson Scotland Manchester United 1994 -- 95 Dalglish, Kenny Kenny Dalglish Scotland Blackburn Rovers 1995 -- 96 Ferguson, Alex Alex Ferguson (2) Scotland Manchester United 1996 -- 97 Ferguson, Alex Alex Ferguson (3) Scotland Manchester United 1997 -- 98 Wenger, Arsene Arsène Wenger France Arsenal 1998 -- 99 Ferguson, Alex Alex Ferguson (4) Scotland Manchester United 1999 -- 2000 Ferguson, Alex Alex Ferguson (5) Scotland Manchester United 2000 -- 01 Burley, George George Burley Scotland Ipswich Town 2001 -- 02 Wenger, Arsene Arsène Wenger (2) France Arsenal 2002 -- 03 Ferguson, Alex Alex Ferguson (6) Scotland Manchester United 2003 -- 04 Wenger, Arsene Arsène Wenger (3) France Arsenal 2004 -- 05 Mourinho, Jose José Mourinho Portugal Chelsea 2005 -- 06 Mourinho, Jose José Mourinho (2) Portugal Chelsea 2006 -- 07 Ferguson, Alex Alex Ferguson (7) Scotland Manchester United 2007 -- 08 Ferguson, Alex Alex Ferguson (8) Scotland Manchester United 2008 -- 09 Ferguson, Alex Alex Ferguson (9) Scotland Manchester United 2009 -- 10 Redknapp, Harry Harry Redknapp England Tottenham Hotspur 2010 -- 11 Ferguson, Alex Alex Ferguson (10) Scotland Manchester United 2011 -- 12 Pardew, Alan Alan Pardew England Newcastle United 2012 -- 13 Ferguson, Alex Alex Ferguson (11) Scotland Manchester United 2013 -- 14 Pulis, Tony Tony Pulis Wales Crystal Palace 2014 -- 15 Mourinho, Jose José Mourinho (3) Portugal Chelsea 2015 -- 16 Ranieri, Claudio Claudio Ranieri Italy Leicester City 2016 -- 17 Conte, Antonio Antonio Conte Italy Chelsea 2017 -- 18 Guardiola, Pep Pep Guardiola Spain Manchester City
Document 13: List of Premier League seasons: Six clubs have won the title: Manchester United (13 times), Chelsea (5), Arsenal (3), Manchester City (3), Blackburn Rovers and Leicester City; Manchester United was the first club to win the league three consecutive seasons in a row twice (1998 -- 99 to 2000 -- 01 & 2006 -- 07 to 2008 -- 09) and Arsenal was the only team to go an entire season without a single defeat in 2003 -- 04. The record number of points accumulated by a team is 100 by Manchester City, who won the Premier League in 2017 -- 18. Crystal Palace, Norwich and Sunderland have been relegated the most times (4) while Derby County accumulated the lowest ever points total with 11 in the 2007 -- 08 season. 16 top goalscorers from 11 different clubs have been awarded the Premier League Golden Boot. Andy Cole and Alan Shearer scored 34 goals in a 42 - game season -- the most in a Premier League season, Mohamed Salah holds the record in a 38 - game season with 32. Dutchman Jimmy Floyd Hasselbaink was the first foreigner to win the award outright in 2000 -- 01 having shared the accolade with Dwight Yorke of Trinidad and Tobago in 1998 -- 99.
Document 14: Arsenal F.C.: They hold the highest number of FA Cup trophies, with 13. The club is one of only six clubs to have won the FA Cup twice in succession, in 2002 and 2003, and 2014 and 2015. Arsenal have achieved three League and FA Cup ``Doubles ''(in 1971, 1998 and 2002), a feat only previously achieved by Manchester United (in 1994, 1996 and 1999). They were the first side in English football to complete the FA Cup and League Cup double, in 1993. Arsenal were also the first London club to reach the final of the UEFA Champions League, in 2006, losing the final 2 -- 1 to Barcelona.
Document 15: Arsenal F.C.: The club's success in the late 1990s and first decade of the 21st century owed a great deal to the 1996 appointment of Arsène Wenger as manager. Wenger brought new tactics, a new training regime and several foreign players who complemented the existing English talent. Arsenal won a second League and Cup double in 1997–98 and a third in 2001–02. In addition, the club reached the final of the 1999–2000 UEFA Cup (losing on penalties to Galatasaray), were victorious in the 2003 and 2005 FA Cups, and won the Premier League in 2003–04 without losing a single match, an achievement which earned the side the nickname "The Invincibles". The feat came within a run of 49 league matches unbeaten from 7 May 2003 to 24 October 2004, a national record.
ground_truth: 1992
sub_queries: What trophy did Arsenal win in the 2003-2004 season without losing a match? Answer: Premier League
When was Premier League established? Answer: 1992