Michael Prestwich is Professor of History at the University of Durham. DAVID CROOK, now retired, spent his working life in The National Archives, where he became immersed in the extensive surviving early records of the English royal administration and common law. From those sources have emerged important findings which may identify a real criminal as the original of the legendary English outlaw Robin Hood. HENRY SUMMERSON was awarded his Ph.D. by Cambridge University for a thesis on crime and law enforcement in England, 1227-1263. He has continued to work in this field, publishing numerous articles on aspects of medieval criminality, and editions, alone or in collaboration, of three crown pleas rolls, for Devon in 1238, Wiltshire in 1268 and Lancashire in 1292. Janet Burton is Professor of Medieval History at University of Wales Trinity Saint David, Lampeter and the author of many books and articles on monastic history. LOUISE J. WILKINSON is Professor of Medieval Studies, University of Lincoln.