ope Stephen VI: had his predecessor exhumed, tried, de-fingered, and thrown to the river
Stephen VI was Pope from 896 to 897. Fueled by his anger with Pope Formosus, his predecessor, he exhumed Formosus's rotting corpse and put "him" on trial, in the so-called "Cadaver Synod" in January, 897.

With the corpse propped up on a throne, a deacon was appointed to answer for the deceased pontiff, who was condemned for performing the functions of a bishop when he had been deposed and for receiving the pontificate while he was the bishop of Porto, among other revived charges that had been leveled against Formosus in the strife during the pontificate of John VIII.

The corpse was found guilty, stripped of its sacred vestments, deprived of three fingers of its right hand (the blessing fingers), clad in the garb of a layman, and quickly buried; it was then re-exhumed and thrown in the Tiber. All ordinations performed by Formosus were annulled.