The Irish Rebellion of 1798, also known as the United Irishmen Rebellion, was an uprising against British rule in Ireland lasting from May to September 1798. The United Irishmen, a republican revolutionary group influenced by the ideas of the American and French revolutions, were the main organising force behind the rebellion.
The prospect of reform inspired a small group of Protestant liberals in Belfast to found the Society of United Irishmen in 1791. The organisation crossed the religious divide with a membership comprising Roman Catholics, Presbyterians, Methodists, other Protestant "dissenters" groups, and some from the Protestant Ascendancy. The Society openly put forward policies of further democratic reforms and Catholic emancipation, reforms which the Irish Parliament had little intention of granting.
The outbreak of war with France earlier in 1793, following the execution of Louis XVI, forced the Society underground and toward armed insurrection with French aid. The avowed intent of the United Irishmen was to "break the connection with England"; the organisation spread throughout Ireland and had at least 200,000 members by 1797. It linked up with Catholic agrarian resistance groups, known as the Defenders, who had started raiding houses for arms in early 1793.