Question: The 1980–81 Irish League championship was won by a club that was founded in what year?

Context paragraphs:
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.

Glentoran F.C.: Glentoran Football Club is a semi-professional football club that plays in the NIFL Premiership.  The club was founded in 1882 and plays its home games at the Oval in east Belfast.  Club colours are red, green and black.  Linfield and Glentoran are nicknamed Belfast's "Big Two", as they have traditionally dominated local football in Northern Ireland since the demise of Belfast Celtic.  The two play a league match on Boxing Day each year, which regularly attracts the largest attendance of the Irish League season.

1980–81 Irish Cup: The 1980–81 Irish Cup was the 101st edition of Northern Ireland's premier football knock-out cup competition.  It began on 31 January 1981, and concluded on 2 May 1981 with the final.

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.

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"

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.

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.

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.

Dungannon Swifts F.C.: Dungannon Swifts Football Club is a Northern Irish, semi-professional football club playing in the NIFL Premiership.  The club, founded in 1949, has risen from the Mid-Ulster league to the top tier in Northern Ireland since its election to the Irish League First Division in 1997.  Dungannon earned promotion from Irish League First Division to the Premier Division in the 2002–03 season.

1980–81 Irish League: The Irish League in season 1980–81 comprised 12 teams, and Glentoran won the championship.

Supporting paragraphs: 1980–81 Irish League Glentoran F.C.
Answer: 1882