Formosus

Pope Formosus (c. 816 – 4 April 896) was the pope and ruler of the Papal States from 6 October 891 until his death on 4 April 896. His reign as Pope was troubled, marked by interventions in power struggles over the Patriarchate of Constantinople, the Kingdom of West Francia, and the Holy Roman Empire. Because he sided with Arnulf of Carinthia against Lambert of Spoleto, Formosus's remains were exhumed and put on trial in the Cadaver Synod.