Daniel(I) O’Connell, hailed in his time as The Liberator, was the acknowledged political leader of Ireland's Roman Catholic majority in the first half of the 19th century. His mobilisation of Catholic Ireland, down to the poorest class of tenant farmers secured the final instalment of Catholic emancipation in 1829 and allowed him to take a seat in the United Kingdom Parliament to which he had been twice elected.

Catholic emancipation or Catholic relief was a process in the kingdoms of Great Britain and Ireland, and later the combined United Kingdom in the late 18th century and early 19th century, that involved reducing and removing many of the restrictions on Roman Catholics introduced by the Act of Uniformity, the Test Acts and the penal laws. Requirements to abjure (renounce) the temporal and spiritual authority of the pope and transubstantiation placed major burdens on Roman Catholics.