The Cadaver Synod (also called the Cadaver Trial or, in Latin, the Synodus Horrenda) is the name commonly given to the posthumous ecclesiastical trial of Catholic Pope Formosus, held in the Basilica of St. John Lateran in Rome during January of 897. The trial was conducted by Formosus’s successor, Pope Stephen (VI) VII. 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. The Cadaver Synod is remembered as one of the most bizarre episodes in the history of the medieval papacy.