Who sought to build a theocracy and base his practice on the bible, not church ritual, and he established headquarters in switzerland?

Jean Calvin sought to build a theocracy and base his practice on the Bibile, not church ritual, and he established headquarters in Switzerland. Jean Calvin was a pastor during the Protestant Reformation and believed in absolute divine power solely through the Holy Bible. Calvin fled France in the wake of violent tensions between Protestants and Catholics and continued his work in Switzerland.

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In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy.