In what year was the team founded that won the 1956-1957 Irish League championship?
1956–57 Irish League The Irish League in season 1956–57 comprised 12 teams, and Glenavon won the championship.
Éire Óg GAA (Carlow) Éire Óg are a GAA club based in Carlow town. The club are solely involved in the sport of gaelic football, fielding teams across all underage categories as well as adult competitions. Formed in 1958, the club has enjoyed tremendous success on the field and are one of the most successful clubs in the history of Carlow GAA. They have won the Carlow Senior Football Championship 26 times, the Leinster Senior Club Football Championship 5 times and were All-Ireland Senior Club Football Championship runners up in 1993 & 1996.