Norman Invasion of Ireland in the context of "Laudabiliter"

Irish nationalism is a nationalist political movement which, in its broadest sense, asserts that the people of Ireland should govern Ireland as a sovereign state. Since the mid-19th century, Irish nationalism has largely taken the form of cultural nationalism based on the principles of national self-determination and popular sovereignty. Irish nationalists during the 18th, 19th, and 20th centuries such as the United Irishmen in the 1790s, Young Irelanders in the 1840s, the Fenian Brotherhood during the 1880s, Fianna Fáil in the 1920s, and Sinn Féin styled themselves in various ways after French left-wing radicalism and republicanism. Irish nationalism celebrates the culture of Ireland, especially the Irish language, literature, music, and sports. It grew more potent during the period in which all of Ireland was part of the United Kingdom, which led to most of the island gaining independence from the UK in 1922.

Irish nationalists believe that foreign English and later British rule in Ireland from the 1169 English Norman Invasion of Ireland onwards has been detrimental to Irish interests. At the time of the partition of Ireland most of the island was Roman Catholic and largely indigenous, while a sizeable portion of the country, particularly in the north, was Protestant and chiefly descended from people of Great Britain who colonised the land as settlers during the reign of King James I in 1609. Partition was along these ethno-religious lines, with most of Ireland gaining independence, while six northern counties remained part of the United Kingdom. Irish nationalists support Irish reunification.