In what year was the team founded that won the 1956-1957 Irish League championship?
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.
Peamount United F.C. Peamount United Football Club (Irish: "Club Sacair Mullaigh na Pise" ) is an Irish association football club based in Newcastle, South Dublin. The club is best known for its senior women's team who in 2011–12 became founder members and inaugural champions of the Women's National League. They have also represented the Republic of Ireland in Europe and in 2011–12 they became the first Republic of Ireland team, including men's team, to qualify from their group for the knockout stages of a European competition. The club's senior men's team compete in the Leinster Senior League. Peamount United also field teams in the Dublin Women's Soccer League, the Dublin and District Schoolboys League and the Metropolitan Girls League.