Social institutions such as the water-powered grain mills of Ottoman Cyprus are elaborately interconnected with a wide range of human and non-human players, from millers and villagers to water, gradient, stone and climate. When participants recognize their mutual dependencies and operate according to social and environmental limits, then following Ivan Illich we can call these watermills convivial tools. The European-owned sugar plantations, mills and refineries of medieval Cyprus, by contrast, divided and alienated their workforce, and their demands for water, labour, soil and fuel surpassed what their landscape and society could provide. They are, then, unconvivial tools. Conviviality is always precarious: it needs continual negotiation, conflict and compromise, as well as an acceptance of the mutual dependence of all participants, non-human and human. This politics of conviviality is particularly urgent in times of social and ecological crisis.

This paper investigates how common intensive milling practices were in southern England during the Romano-British period, by analysing the distribution of millstones, based on an extensive corpus of almost 4,500 querns and millstones compiled by the author. In order to do this, it was necessary to establish criteria for distinguishing millstones from rotary querns, the details of which are set out in an accompanying appendix; this is something which has hitherto not been published. Using the guidelines thereby defined, the distribution of millstones is considered and described by stone type. The resulting data are then used to discuss the following key points: How frequently did mills occur? What types of mills were in use, and when? What were those mills used for?