Society of United Irishmen in the context of "Irish nationalism"

The Irish Rebellion of 1798 (Irish: Éirí Amach 1798; Ulster Scots: The Turn Out, The Hurries) was a popular insurrection against the British Crown in what was then the separate, but subordinate, Kingdom of Ireland. The main organising force was the Society of United Irishmen. First formed in Belfast by Presbyterians opposed to the landed Anglican establishment, the Society, despairing of reform, sought to secure a republic through a revolutionary union with the country's Catholic majority. The grievances of a rack-rented tenantry drove recruitment.

While assistance was being sought from the French Republic and from democratic militants in Britain, martial-law seizures and arrests forced the conspirators into the open. Beginning in late May 1798, there were a series of uncoordinated risings: in the counties of Carlow and Wexford in the southeast where the rebels met with some success; in the north around Belfast in counties Antrim and Down; and closer to the capital, Dublin, in counties Meath and Kildare.

The Defenders (Irish: Na Cosantóirí) were a Catholic agrarian secret society in 18th-century Ireland, founded in County Armagh. Initially, they were formed as local defensive organisations opposed to the Protestant Peep o' Day Boys; however, by 1790 they had become a secret oath-bound fraternal society made up of lodges. By 1796, the Defenders had allied with the United Irishmen, and participated in the 1798 rebellion. By the 19th century, the organisation had developed into the Ribbonmen.

The Belfast Harp Society (1808–1813) and its successor, the Irish Harp Society (1819–1839), were philanthropic associations formed in the town of Belfast, Ireland, for the purpose of sustaining the music and tradition of itinerant Irish harpists, and secondarily, of promoting the study of the Irish language, history, and antiquities. For its patronage, the original society drew upon a diminishing circle of veterans of the patriotic and reform politics of the 1780s and 1790s, among them several unrepentant United Irishmen. In its sectarian division, Belfast became increasingly hostile to Protestant interest in distinctive Irish culture. The society reconvened as the Irish Harp Society in 1819 only as a result of a large and belated subscription raised from expatriates in India. Once that source was exhausted, the new society ceased its activity.