Kammala wannan jumla: Wani Bishop Pietro yana daya daga cikin wadanda a 1241 aka yi fursunoni da Sarkin sarakuna Frederick II a
Yaƙin Giglio, yayin da suke kan hanyarsu ta halartar majalisa a Rome wanda 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.