▁the ▁ 8 th ▁Century , ▁and ▁around ▁ 8 4 0 ▁the ▁parish ▁church ▁of ▁St . ▁Martin ▁was ▁first ▁mentioned . ▁ ▁In ▁ 9 4 0 ▁King ▁Otto ▁I ▁gave ▁the ▁Z ill is ▁Church ▁to ▁the ▁Bishop ▁of ▁Ch ur . ▁ ▁This ▁gift ▁did ▁not ▁include ▁the ▁church ' s ▁property , ▁four ▁large ▁far ms ▁in ▁Sch ams ▁and ▁Rhein wald . ▁ ▁In ▁ 1 4 7 3 ▁the ▁V iam ala ▁road ▁over ▁the ▁Al ps ▁opened , ▁which ▁increased ▁traffic ▁on ▁the ▁S pl ü gen ▁and ▁San ▁Bernard ino ▁passes . ▁ ▁The ▁villages ▁fl our ished ▁with ▁this ▁increased ▁trade . ▁ ▁In ▁ 1 5 3 0 - 3 5 ▁Z ill is ▁and ▁Re ischen ▁converted ▁during ▁the ▁Protest ant ▁Re formation . ▁ ▁In ▁ 1 8 1 8 - 2 3 ▁the ▁V iam ala ▁road ▁was ▁expanded ▁with ▁a ▁wider ▁road , ▁which ▁brought ▁increased ▁trade ▁into ▁the ▁villages . ▁ ▁Geography ▁Z ill is - Re ischen ▁has ▁an ▁area , ▁, ▁of ▁. ▁ ▁Of ▁this ▁area , ▁ 3 2 . 5 % ▁is ▁used ▁for ▁agricult ural ▁purposes , ▁while ▁ 4 2 . 8 % ▁is ▁for ested . ▁ ▁Of ▁the ▁rest ▁of ▁the ▁land , ▁ 1 . 8 % ▁is ▁settled ▁( build ings ▁or ▁roads ) ▁and ▁the ▁remainder ▁( 2 2 . 9 %) ▁is ▁non - product ive ▁( ri vers , ▁gla ci ers ▁or