This research was initiated as part of ESRC-funded doctoral work, continued under an Institute of Historical Research and Economic History Society postdoctoral fellowship, and developed under an ESRC research grant. The aim of the project was to use tithe data to estimate agricultural output for one region of England during the middle ages. These estimates were then used to assess the impact of crises including war with Scotland and the Black Death. They were also used to examine the relationship between producers and the market. This digital resource contains receipts from grain tithes in parishes appropriated by Durham Priory. The receipts sometimes take the form of quantities of grain but more usually of cash sums for which the tithes were sold. The database also contains indices of total output in the parishes, based on the tithe data. Please note: this study does not include information on named individuals and would therefore not be useful for personal family history research.