2021 saw the centenary of the formation of the League of Ireland, the Republic of Ireland’s primary professional association football league. This new collection draws on the work of a number of leading historians of Irish soccer and seeks to examine a number of previously under-researched aspects relating to the league. The book examines the initial growth of clubs in Dublin and the Free State League’s early turbulent history, while the impact of Irish players and administrators on the development of soccer clubs at home and abroad is also assessed. Following the partition of Ireland in 1921, players continued to move from Dublin clubs to those in Northern Ireland and this is also discussed, particularly in light of the Troubles of 1968–1998. Despite the migration of many Irish-born players to Britain, the League of Ireland has also attracted internationally based players and the impact of this is also examined. The role of the league in the provision of players for the Irish Olympic team is also explored, as is the work of SARI in its attempts to eradicate racism from Irish sport. This publication aims to commemorate some of those who have strived to maintain the League of Ireland’s presence against the backdrop of what has become the world’s most attractive football league, located in Ireland’s neighbour, England. It will be of interest to researchers and advanced students of Sports, History, Sociology and Politics. This book was originally published as a special issue of the journal, Soccer & Society.