The article (in The Conversation) covers the mediaeval equivalent of impeachment in the case of pope Formosus in 897 and compares this to the impeachment of Donald Trump. The inspiration for the article were the comments by Senator Lindsey Graham who claimed that impeaching Trump would be the same as impeaching George Washington "because he owned slaves". Like Trump, Formosus had dimmitted office and, like George Washington, he was dead at the time of the trial. This did not stop his successor, Pope Stephen VI, from staging the trial: Formosus' corpse was disenterred, dressed in papal vestments and eventually condemned of perjury and bigamy. The corpse was subsequently thrown in into the river Tiber.
Frederik Pedersen interviewed by Australian Radio about article on the "Cadaver Synod" of 897