William III of England (1650 - 1702), whose statue on a horse stands in College Green, is known in Ireland, mainly among Unionists, as King Billy. A Dutch aristocrat and a Protestant Prince of Orange, he won the English, Scottish and Irish Crowns after defeating his uncle and father-in-law, the Catholic king James II. In Ireland, the decisive battles between the Williamites and the Jacobites were the battle of the Boyne (1690) and the Battle of Aughrim in Co. Galway (1691). The latter battle was the bloodiest ever fought on Irish soil (over 7,000 people were killed) and practically ended Jacobitism in Ireland.