ect ory . ▁ ▁Char ter house ▁The ▁Car th us ians ▁founded ▁a ▁monaster y ▁in ▁ 1 3 6 6 / 6 7 ▁in ▁what ▁is ▁called ▁Val ▁Gra z ios a , ▁a ▁plain ▁over look ed ▁by ▁the ▁Mont i ▁P is ani ▁(" P isan ▁Mountains "), ▁when ▁Francesco ▁Mor ic otti ▁Pr ign ani ▁was ▁arch bishop ▁of ▁P isa . ▁Short ly ▁afterwards ▁Pope ▁Gregory ▁XI , ▁a ▁noted ▁reform er ▁of ▁monaster ies , ▁exp elled ▁the ▁mon ks ▁from ▁the ▁Bened ict ine ▁G org ona ▁Ab bey , ▁on ▁the ▁island ▁of ▁G org ona , ▁and ▁gave ▁the ▁island ▁and ▁the ▁estate ▁to ▁the ▁Car th us ians ▁of ▁Val ▁Gra z ios a , ▁who ▁rep op ulated ▁them . ▁This ▁event ▁must ▁have ▁happened ▁not ▁long ▁before ▁Catherine ▁of ▁S ien a ' s ▁visit ▁of ▁ 1 3 7 5 , ▁as ▁she ▁mentions ▁in ▁her ▁letters ▁the ▁need ▁to ▁convert ▁the ▁facilities ▁for ▁the ▁Car th us ian ▁use . ▁Bened ict ines ▁were ▁bar red ▁from ▁the ▁island . ▁ ▁In ▁ 1 4 2 5 , ▁the ▁Mediter rane an ▁reached ▁a ▁peak ▁of ▁political ▁inst ability . ▁The ▁peace ▁and ▁safety ▁of ▁the ▁mon ks ▁on ▁G org ona ▁could ▁no ▁longer ▁be ▁assured . ▁F ear ing ▁a ▁Sar ac en ▁attack ▁they ▁abandoned ▁the ▁monaster y ▁and ▁took ▁up ▁residence ▁at ▁Cal ci , ▁bringing ▁the ▁records ▁from ▁G org ona ▁with ▁them