Fenian Society

The Fenian Brotherhood (Irish: Bráithreachas na bhFíníní) was an Irish republican organisation founded in the United States in 1858 by John O'Mahony and Michael Doheny. It was a precursor to Clan na Gael, a sister organisation to the Irish Republican Brotherhood. Members were commonly known as "Fenians". O'Mahony, who was a Celtic scholar, named his organisation after the Fianna, the legendary band of Irish warriors led by Fionn mac Cumhaill.

The Fenian Brotherhood trace their origins back to 1798 and the United Irishmen, who had been an open political organisation only to be suppressed and became a secret revolutionary organisation, rose in rebellion, seeking an end to British rule in Ireland and the establishment of an Irish Republic. The rebellion was suppressed, but the principles of the United Irishmen were to have a powerful influence on the course of Irish history.

Following the collapse of the rebellion, the British Prime Minister William Pitt introduced a bill to abolish the Irish parliament and manufactured a Union between Ireland and Britain. Opposition from the Protestant oligarchy that controlled the parliament was countered by the widespread and open use of bribery. The Act of Union was passed, and became law on 1 January 1801. The Catholics, who had been excluded from the Irish parliament, were promised emancipation under the Union. This promise was never kept, and caused a protracted and bitter struggle for civil liberties. It was not until 1829 that the British government reluctantly conceded Catholic Emancipation. Though leading to general emancipation, this process simultaneously disenfranchised the small tenants, known as 'forty shilling freeholders', who were mainly Catholics.

...
Wikipedia