I was just looking up about Medieval Antipopes, and found this about the trial of a maligned pontif:

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 Pope Formosus, held in Rome on January of 897. During the proceedings, the decomposing body of Formosus, who had been dead for nine months, was dressed in his papal vestments and seated on a throne while his successor, Pope Stephen VII, read the charges against him and conducted the trial.

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