Rubuta ci gaba don wannan sakin layi - Wani Bishop Pietro yana ɗaya daga cikin waɗanda a cikin 1241 Sarkin sarakuna Frederick II ya ɗaure su a Yaƙin Giglio
, yayin da suke kan hanyarsu ta halartar majalisa a Roma da Paparoma Gregory IX ya kira. Bishop Melchiorre Busseto a cikin 1284 mabiyan William VII, Marquess na Montferrat ne suka kashe shi, wanda Marquess ya rasa duk haƙƙoƙinsa na tallafi a cikin Diocese na Tortona, kuma an tilasta shi, ƙafafun ƙafa da sutura a cikin rigar kawai, don tafiya daga wurin kisan bishop zuwa babban coci.