Joan of Arc's case was only looked at -- 25 years after her execution by the Catholic church -- because the king of France, restored to his throne by Joan in person, was being called "An illegitimate king" because he was placed there by a duly convicted (per the Catholic church) witch.
What I'm writing is factual -- something had to be done to save that worthless king; and the Orthodox" Catholic authorities found a way to do it.
In today's world, you can marry in the Catholic church, have five kids, and get your marriage annulled. Guess what that takes?
Her "conviction" was overturned because of the various outrages of this "trial" -- e.g., refusal to grant the accused an advocate, the behavior of the judges (who deliberately tried to trick the accused), the housing conditions of the accused, and refusing the accused her appeal to Rome.
Guess what THAT takes?