The Anglo-Saxon period was crucial in the development of England's character: its language, and much of its landscape and culture, were forged in the period between the fifth and the eleventh centuries. Historians and archaeologists have long been fascinated by its regional variations, by the way in which different parts of the country displayed marked differences in social structures, settlement patterns, and field systems. In this controversial and wide-ranging study, the author argues that such differences were largely a consequence of environmental factors: of the influence of climate,...