The Battle of the Boyne took place in 1690 between the forces of the deposed King James II, and those of King William III who, with his wife Queen Mary II, had acceded to the Crowns of England and Scotland in 1689. The battle was fought across the River Boyne close to the town of Drogheda in the Kingdom of Ireland, modern-day Republic of Ireland, and resulted in a victory for William. This turned the tide in James's failed attempt to regain the British crown and ultimately aided in ensuring the continued Protestant ascendancy in Ireland.

James VII and II was King of England and Ireland as James II and King of Scotland as James VII from the death of his elder brother, Charles II, on 6 February 1685. He was deposed in the Glorious Revolution of 1688. He was the last Catholic monarch of England, Scotland, and Ireland. His reign is now remembered primarily for conflicts over religious tolerance, but it also involved struggles over the principles of absolutism and the divine right of kings. His deposition ended a century of political and civil strife in England by confirming the primacy of the English Parliament over the Crown.