The Battle of the Boyne (Irish: Cath na Bóinne IPA: [ˈkah n̪ˠə ˈbˠoːn̪ʲə]) was a battle in 1690 between the English King James II, and the Dutch Prince William of Orange, who, with his wife,Mary II (his cousin and James’ daughter), had overthrown James in England in 1688. The battle took place across the River Boyne near the town of Drogheda on the east coast 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.
The battle took place on 1 July 1690 in the old style (Julian) calendar. This was equivalent to 11 July in the new style (Gregorian) calendar, although today its commemoration is held on 12 July, on which the decisive Battle of Aughrim was fought a year later. William’s forces defeated James’s army, which consisted mostly of raw recruits. The symbolic importance of this battle has made it one of the best-known battles in the history of the British Isles and a key part of the folklore of the Orange Order. Its commemoration today is principally by the ProtestantOrange Institution.