▁goods ▁for ▁Japanese ▁silver ▁and ▁prof ited ▁imm ens ely . ▁ ▁The ▁Nan ban ▁trade , ▁as ▁this ▁Euro - J apan ese ▁trade ▁activity ▁came ▁to ▁be ▁called , ▁was ▁closely ▁tied ▁to ▁the ▁propag ation ▁of ▁Christian ity . ▁Portuguese - sp ons ored ▁Jes uits ▁took ▁the ▁lead ▁in ▁pros ely t izing ▁in ▁Japan , ▁and ▁the ▁fait ▁accomp li ▁was ▁approved ▁in ▁Pope ▁Gregory ▁XIII ' s ▁pap al ▁b ull ▁of ▁ 1 5 7 5 , ▁which ▁decided ▁that ▁Japan ▁belonged ▁to ▁the ▁Portuguese ▁Dioc ese ▁of ▁Mac au . ▁Hence ▁the ▁Jes uits ▁enjoyed ▁the ▁exclusive ▁right ▁to ▁propag ate ▁Christian ity ▁in ▁Japan , ▁which ▁meant ▁their ▁spons ors , ▁the ▁Portuguese , ▁had ▁the ▁exclusive ▁right ▁to ▁trade ▁with ▁Japan ▁within ▁Christ end om . ▁ ▁The ▁Christian ▁mission ▁in ▁Japan ▁enjoyed ▁early ▁success ▁among ▁the ▁war ring ▁da im yo ▁of ▁the ▁S eng oku ▁period , ▁because ▁Portuguese ▁trad ers , ▁under ▁the ▁influence ▁of ▁the ▁mission aries , ▁were ▁more ▁willing ▁to ▁stop ▁at ▁ports ▁belonging ▁to ▁a ▁Christian ▁lord , ▁which ▁for ▁the ▁da im yo ▁meant ▁better ▁access ▁to ▁European ▁fire ar ms . ▁This ▁situation ▁gradually ▁changed ▁as ▁Toy ot omi ▁H ide y oshi ▁came ▁close ▁to ▁un ifying ▁Japan ▁and ▁became ▁concerned ▁about ▁potential ▁decent ral izing ▁factors , ▁such ▁as ▁v ass als ▁following ▁a ▁foreign ▁religion . ▁In ▁ 1 5 8 7 , ▁after ▁a ▁cord ial ▁audience ▁with ▁Gas par