Thomas Paliser Russell was a founding member, and leading organiser, of the United Irishmen marked by his radical-democratic and millenarian convictions. A member of the movement's northern executive in Belfast, and a key figure in promoting a republican alliance with the agrarian Catholic Defenders, he was arrested in advance of the risings of 1798 and held until 1802. He was executed in 1803, following Robert Emmet's aborted rising in Dublin for which he had tried, but failed, to raise support among United and Defender veterans in the north.

The Society of United Irishmen was a sworn association, formed in the wake of the French Revolution, to secure representative government in Ireland. Despairing of constitutional reform, and in defiance both of British Crown forces and of Irish sectarian division, in 1798 the United Irishmen instigated a republican rebellion. Their suppression was a prelude to the abolition of the Irish Parliament in Dublin and to Ireland's incorporation in a United Kingdom with Great Britain.