Pope Stephen VI was the bishop of Rome and ruler of the Papal States from 22 May 896 to his death. He is best known for instigating the Cadaver Synod, which ultimately led to his downfall and death.

The Cadaver Synod is the name commonly given to the ecclesiastical trial of Pope Formosus, who had been dead for about seven months, in the Basilica of St. John Lateran in Rome during January 897. The trial was conducted by Pope Stephen VI, the successor to Formosus' successor, Pope Boniface VI. Stephen had Formosus' corpse exhumed and brought to the papal court for judgment. He accused Formosus of perjury, of having acceded to the papacy illegally, and illegally presiding over more than one diocese at the same time. At the end of the trial, Formosus was pronounced guilty, and his papacy retroactively declared null.