The Williamite War in Ireland (1688–1691) was a conflict between Jacobites (supporters of the Catholic King James II of England and Ireland, VII of Scotland) and Williamites (supporters of the Dutch Protestant Prince William of Orange) over who would be monarch of the Kingdom of England, the Kingdom of Scotland and the Kingdom of Ireland. It is also called the Jacobite War in Ireland or the Williamite–Jacobite War in Ireland.
The cause of the war was the deposition of James as King of the Three Kingdoms in the "Glorious Revolution" of 1688. James was supported by the mostly Catholic "Jacobites" in Ireland and hoped to use the country as a base to regain his Three Kingdoms. He was given military support by France to this end. For this reason, the war became part of a wider European conflict known as the Nine Years' War (or War of the Grand Alliance). Some Protestants of the established Church in Ireland also fought on the side of King James.