The mass suicide and murder of the men, women and children of the Jewish community in York on 16 March 1190 is one of the most scarring events in the history of Anglo-Judaism, and an aspect of England's medieval past which is widely remembered around the world. However, the York massacre was in fact only one of a series of attacks on communities of Jews across England in 1189-90; they were violent expressions of wider new constructs of the nature of Christian and Jewish communities, and the targeted outcries of local townspeople, whose emerging urban politics were enmeshed within the swiftly...