This lecture is the fourth 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 ‘Revolutionary Ulster, c.1770-1800’, covering the Volunteer Movement, the Society of United Irishmen, the formation of the Orange Order, the 1798 Rising and the Act of Union. The speaker, Dr Andrew Holmes, is a lecturer 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.