The essays collected here have in common the concept of boundaries, which is defined according to discipline, and movement through boundaries. The essays cover a range of topics and periods. The first section consists of literary approaches to boundaries, ranging widely in subject matter from Norman drama to sixteenth-century goodnight ballads. The second section includes mainly historical studies of such topics as social mobility in Geoffrey of Monmouth's twelfth-century History of the Kings of Britain, post-1453 Byzantine identity, and Milanese Renaissance musical genres. Individually and as a group, the essays contribute fresh insights into well-known and some less familiar works of the Middle Ages and the Renaissance.