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.
Old Belvedere Cricket Club Old Belvedere Cricket Club was a cricket club in Dublin, Ireland, that played in the Leinster Senior League. The club was founded in 1950 and promoted to the Senior League in 1957.