The aim of this thesis, ‘The Castle in the Social and Geographical Landscape of Cumbria, 1066-1250 A.D.’, was to examine the medieval castle within the confines of the county of Cumbria, as defined in 1974. The areas of inquiry include the ecclesiastical, political, urban, rural, regional and geographical landscapes in which the castle interacts. An interdisciplinary methodology was adopted, using historical, archaeological, topographical and toponymic research. By using as broad a framework as possible, the most comprehensive picture of the medieval castle will emerge. The interaction of the castle with the various landscapes creates reactions and interrelationships within the defined area. By utilising diverse methods, a more holistic understanding of the castle can be formulated.