In 1690, King William III clashed with his father-in-law, King James II, on the River Boyne at Oldbridge, County Meath. There were 36,000 men on the Williamite side and 25,000 on the Jacobite side, the largest number of troops ever deployed on an Irish battlefield. The British throne, French dominance in Europe, and religious power in Ireland were at stake. William was victorious – and the continent was changed forever. The visitor centre is now situated on the battleground itself in a recently restored eighteenth-century house and contains original weapons and a laser model of the battlefield.