Rory MacLellan is a postdoctoral research fellow at Historic Royal Palaces. He specialises in medieval religious history, especially the crusades and the military-religious orders. His first book is Donations to the Knights Hospitaller in Britain and Ireland, 1291-1400 (2021).

Introduction, 1. Memories of the Military Orders in Britain in the Seventeenth and Eighteenth Centuries, 2. Rosslyn Chapel: Templar Pseudo-history, 'Symbology', and the Far-right, 3. Acquiring Heritage: The Venerable Order of St John and the Accumulation of its Past (1858-1931), 4. Reconstructing the Past: The Memory and Tradition of the Order of the Hospitaller Knights of St John in Modern Greece (19th-20th Centuries), 5. Taking the Cross and Asserting Freedom: Catholic Liberalism, the Military Orders, and the Perception of the Crusades in Mexico in the first half of the 19th Century, 6. The Internet Crusade Against Communism: Political neomedievalism in 21st century Brazil.