The origin of Fenianism may be traced to Wolfe Tone and the United Irishmen of the 1790s and to the Young Irelanders of the 1840s. The official title of the organisation whose members became known as 'Fenians' was the Irish Republican Brotherhood (IRB), founded in 1858. The term derived from the name of its twin organisation in America, the Fenian Brotherhood. The spread of the two organisations ushered in a new era in the growth of Irish politics...