▁between ▁Jews ▁and ▁Christians , ▁suggesting ▁Jews ▁were ▁more ▁embedded ▁into ▁Christian ▁society ▁than ▁was ▁previously ▁thought . ▁ ▁Jonathan ▁El uk in ▁is ▁one ▁historian ▁who ▁thinks ▁in ▁this ▁ve in , ▁as ▁el uc id ated ▁in ▁his ▁book ▁Living ▁T ogether , ▁Living ▁A part . ▁He ▁shows ▁that ▁during ▁the ▁Cr us ades , ▁some ▁Jews ▁were ▁hidden ▁and ▁protected ▁from ▁being ▁attacked ▁by ▁Christians . ▁Some ▁Jews ▁worked ▁in ▁Christian ▁villages . ▁There ▁were ▁also ▁several ▁cases ▁of ▁conversion ▁to ▁J uda ism ▁as ▁well ▁as ▁inter fa ith ▁mar ri ages . ▁ ▁One ▁such ▁case ▁was ▁Jacob ▁ben ▁S ull am , ▁a ▁Christian ▁looking ▁to ▁become ▁a ▁part ▁of ▁Jewish ▁society . ▁He ▁chose ▁to ▁" s la ugh ter ▁[ him self ]" ▁of ▁his ▁Christian ▁identity ▁in ▁the ▁hope ▁of ▁being ▁accepted ▁as ▁a ▁Jew ▁in ▁the ▁Jewish ▁community . ▁ ▁As ▁Christians ▁sought ▁conversion ▁to ▁J uda ism , ▁a ▁number ▁of ▁Jews ▁similarly ▁wanted ▁to ▁convert ▁to ▁Christian ity . ▁For ▁example , ▁H erman , ▁a ▁Jew ▁who ▁adopted ▁Christian ity ▁to ▁the ▁degree ▁that ▁his ▁family ▁wor ried ▁that ▁he ▁would ▁reject ▁his ▁Jewish ▁her itage ▁completely . ▁H erman ' s ▁conversion ▁start led ▁the ▁rabb is ▁and ▁made ▁them ▁fear ▁losing ▁other ▁Jews ▁to ▁Christian ity . ▁ ▁The ▁close ▁b onds ▁between ▁Jewish ▁and ▁Christian ▁neighb ors ▁led ▁to ▁Jewish ▁communities ▁th riv ing ▁in ▁some ▁Christian ▁cities . ▁Jews ▁experienced ▁economic ▁security ▁and ▁prosper ity