This lecture is the third in a six-part series exploring Irish history from the Plantation of Ulster to Partition, organised to mark the 250th anniversary of Armagh Robinson Library, Northern Ireland’s oldest public library. It considers the Williamite-Jacobite War, 1689-91, setting it within a European, British and Irish context. The speaker, David Hayton, is Emeritus Professor of Early Modern British and Irish History. Prior to his retirement in 2014 he was Head of the School of History and Anthropology at Queen’s University Belfast. The lecture was organised by Armagh Robinson Library, working in collaboration with Armagh City, Banbridge and Craigavon Borough Council and part-financed by the NI Executive Office. The Library is also grateful for support from the Northern Ireland Museums Council through its ‘Museums Connect’ programme.