 Complete the following phrase:  On 16 March 1190, a mob of townsfolk forced the Jews in York to flee into Cliffords Tower, which was under the control of the sheriff. The castle was set on fire and the Jews were massacred. It is likely that various local magnates who were debtors of the Jews helped instigate this massacre or, at least, did nothing to prevent it. It came during a time of widespread attacks against Jews in Britain. The Jewish community in York did recover after the massacre and a Jewish presence remained in York until 