The League of Ireland is the top-tier of club football in the Republic of Ireland. The league was founded in 1921 as a league of eight clubs and it has now expanded into a two-tiered league of 19 clubs. The league is known as the Airtricity League due to sponsorship. It is split into the League of Ireland Premier Division and the League of Ireland First Division.

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Shamrock Rovers have won the most league championships, they Shelbourne and Bohemians are the most dominant clubs in the league as they have all won over ten league titles each. The Irish domestic cups are the FAI Cup and the League of Ireland Cup. The two Dublin clubs Shamrock Rovers and Bohemians have an intense rivalry, the biggest in the league, commonly known as the Red Dublin Derby. In 2011 Shamrock Rovers reached the group stage in the UEFA Europa League, the first time in their history; they played two matches won one and lost one, beating FK Partizan 2-1. For more information on the League of Ireland, visit the official website or read the wikipedia entry.