Not every place that existed in 1086 appears in the Domesday Book. We know this from other evidence - such as Anglo-Saxon charters, architectural evidence or the origins of the place-name itself.
The 'Exon Domesday' manuscript is a unique survival from William the Conqueror's Domesday Survey of 1086. It contains complex ... fuller than Exchequer's. The book is kept in Exeter Cathedral ...