The Cadaver Synod (also called the Cadaver Trial; Latin: Synodus Horrenda) is the name commonly given to the posthumous ecclesiastical trial of Pope Formosus, held in the Basilica of St. John Lateran in Rome during January 897.^[1] The trial was conducted by Pope Stephen VI (sometimes called Stephen VII), who was the successor to Formosus' successor, Pope Boniface VI. Stephen accused Formosus of perjury and of having acceded to the papacy illegally. At the end of the trial, Formosus was pronounced guilty and his papacy retroactively declared null.

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