Question: In what year was the team founded that won the 1956-1957 Irish League championship?

Context paragraphs:
Billy Neill: Billy Neill was a footballer who played in the Irish League with Glentoran from 1950-1963.  With the Glens, he won the Irish League championship in 1952/53, the Gold Cup twice, the City Cup and the Ulster Cup once each.  He was capped fourteen times by the Irish League between 1952 and 1959.  He was the Ulster Footballer of the Year for the 1959/60 season.

Maurice McVeigh: Maurice McVeigh was a footballer from Northern Ireland who played with Glenavon from 1948.  Nicknamed "Twinkle Toes", he was a member of Glenavon's first-ever Irish League championship teams.  A shipyard worker from Belfast, he won eleven amateur international caps for Northern Ireland and three inter-league caps for the Irish League.  He was the Ulster Footballer of the Year for the 1954/55 season.

Glenavon F.C.: Glenavon Football Club is a semi-professional, Northern Irish football club playing in the NIFL Premiership.  The club, founded in 1889, hails from Lurgan and plays its home matches at Mourneview Park.  Club colours are blue and white.  Gary Hamilton has been player-manager of the Lurgan Blues since December 2011 following the resignation of Marty Quinn.

Stephen Beatty: Stephen Beatty (born 1 September 1969 in Carrickfergus) is a former professional Northern Irish football midfielder who began his career playing for Carrick Rangers in Northern Ireland.  In June 1988 he signed with English second level side Chelsea, that won promotion from the English Second Division that season, but Stephen Beatty failed to make an impact in the first team.  With no chance of playing top-flight level with Chelsea the following season, he then signed with Danish top-flight side AGF Aarhus, but only got to play a few league games in 1990 before moving back to Northern Ireland, where he became Irish League Champion four times, playing for Linfield.  He has been capped twice for the Northern Ireland under-21 national team.  Stephen has recently been a coach for Irish League side Newry City FC and has recently become a coach at Whitehead Eagles Football Club.  Stephen originates from Rathcoole, Newtownabbey, Co.  Antrim.

Coleraine F.C.: Coleraine Football Club is a Northern Irish semi-professional football club, playing in the NIFL Premiership.  The club, founded in 1927, hails from Coleraine, County Londonderry and plays its home matches at The Showgrounds.  Club colours are blue and white.  The current manager is Oran Kearney.The Bannsiders won the Irish League title once (in 1973–74) and the Irish Cup on five occasions, most recently in 2002–03.  They are also the only Irish League club to have won two successive all-Ireland competitions, lifting the Blaxnit Cup in 1969 and 1970. The club is bitter rivals with Ballymena United with their matches being known as the "North West Derby"

Sammy Hughes (footballer): Sammy Hughes was a footballer who played in the Irish League with Glentoran in the 1950s.  He signed from Larne in September 1949, He won two Irish League championships (1950/51 and 1952/53), one Irish Cup (1950/51), one Gold Cup, three City Cups and two Ulster Cups.  He was capped eight times by the Irish League and scored five goals.  He was the Ulster Footballer of the Year for the 1952/53 season.  He later played for Larne and Carrick Rangers, winning the B Division title with the latter in 1961/62.

Derry City F.C.: The club, founded in 1928, initially played in the Irish League, the domestic league in Northern Ireland, and won a title in 1964–65.  In 1971, security concerns related to the Troubles meant matches could not be played at the Brandywell.  The team played home fixtures 30 mi away in Coleraine.  The security forces withdrew their objections to the use of the Brandywell the following year, but in the face of insistence from the Irish League that the unsustainable arrangement continue, the club withdrew from the league.  After 13 years in junior football, it joined the League of Ireland's new First Division for 1985–86.  Derry won the First Division title and achieved promotion to the Premier Division in 1987, and remained there until the 2009 relegation.  The club won a domestic treble in 1988–89, the only League of Ireland club so far.

Belfast Celtic F.C.: Belfast Celtic Football Club was a football club in Northern Ireland that was founded in 1891, and was one of the most successful teams in Ireland until it withdrew from the Irish League in 1949.  It left the league for political reasons, as the team and its supporters were largely Catholic and Irish nationalist, and its players had been violently attacked by a mob against its main rival Linfield in December 1948.  Belfast Celtic were one of four clubs that made the biggest crowds in the Irish League, the other three being Linfield, Distillery, and Glentoran.

1956–57 Irish League: The Irish League in season 1956–57 comprised 12 teams, and Glenavon won the championship.

Dougie Wood: Dougie Wood (born 15 February 1940) is a Scottish former footballer, who played for eleven seasons with Derry City from 1961-1972 in the Irish League.  He won six inter-league caps for the Irish League between 1964 and 1967, and won the Irish Cup in 1963/64, the Irish League championship and the Gold Cup in 1964/65.  He was the Ulster Footballer of the Year for the 1964/65 season.  He also managed the club as player-manager between July 1971 and July 1972.

Supporting paragraphs: 1956–57 Irish League Glenavon F.C.
Answer: 1889