The Norman cathedral at Durham, built between 1093 and 1133, is a vast and awe-inspiring structure, a symbol of conquest and the harsh imposition of a new order. Its roots, origins and even some of the personalities involved are well-documented, but the fabric itself has a story to tell. It begs questions: 'How could this have been done?'; 'Why can this detail be seen?'; 'What does this imply in terms of the issues the master mason faced?'. Fine-grained observations of slight variations in the stonework, in the structural levels, in the many scars, and not least in the dimensions of the entire plan and even the thicknesses of mortar, provide structural clues. In this new and revealing study such 'evidences' are demonstrated and analysed, and many plans, sections and diagrams are presented to the reader to check, to accept, to modify or to challenge. AUTHOR: Brian K. Roberts is a retired geography lecturer. His work involved teaching and research in the field of historical geography and the evolution of rural settlement in the UK. While not an architect, practical experience in surveying and the archaeology of rural landscapes established a strong foundation of pragmatic observation in architectural history. He lives in Durham. 30 colour illustrations, 33 line drawings