Fr. Michael O’Flanagan was a Catholic priest and Irish republican from Roscommon, nicknamed The Sinn Féin Priest. He was one of the few clergy during the revolutionary period who openly supported the Irish republican movement and faced many years suspended from the priesthood of a result. He served as both Vice-President for the Gaelic League and Sinn Féin respectively. O’Flanagan was also renowned as a powerful orator, his speech at Jeremiah O’Donovan Rossa’s funeral was so profound that Constance Markievicz, who was a Protestant at the time, began to consider converting to Catholicism.