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William III, King of Great Britain and Ireland, at the Battle of the Boyne, 1690. William (1650-1702) became king in 1689. The following year he defeated supporters of the deposed James II at the Battle of the Boyne outside the Irish town of Drogheda. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

William III, King of Great Britain and Ireland, at the Battle of the Boyne, 1690. William (1650-1702) became king in 1689. The following year he defeated supporters of the deposed James II at the Battle of the Boyne outside the Irish town of Drogheda. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)