Joan of Arc, Rehabilitation trial
The Rehabilitation trial of Joan of Arc (also known as the Nullification trial of Joan of Arc), held in 1455-56, refers to the hearings conducted by a Papal Commission appointed by Pope Calixtus III for the purpose of examining the circumstances surrounding, and conduct of, the 1431 Trial of Joan of Arc at which she was condemned as a heretic and burned at the stake.
During the course of the hearings and the preliminary investigations preceeding the hearings, a large amount of testimony from over a hundred witnesses was gathered. Much of what is now known about Joan's life and deeds stems from this body of evidence.
Background
As the Hundred Years' War wound to a conclusion in the middle of the 15th century, the French forces of Charles VII entered the city of Rouen, the former administrative capital of the English in France. As a result, the records of the 1431 Trial of Joan of Arc on charges of heresy became available to the French.
Charles owed his crown to Joan who, in obedience to what she asserted to be a command from God, had intervened on behalf of France two years prior to that to lift the English seige of Orleans and turn the tide of the war at the very moment when it appeared that the Anglo - Burgundian alliance would finally prove victorious. The outcome of the trial, which convicted Joan of heresy and had her burnt at the stake, left Charles in a position where it appeared that he owed his crown to a convicted heretic. This was, at least in part, the motive for the trial.
In order to remove this stain from his crown, Charles set in motion an investigation of the earlier trial which would, after a few years' time, lead to a re-opening of the case and a complete reversal of the previous verdict and the vindication of Joan in what has come to be known as the Rehabilitation Trial of Joan of Arc.
Royal Commission
As a first step in examining the case of Joan of Arc, Charles, in a letter of February 15, 1450, appointed a Royal Commission headed by Guillaume Bouillé, the Dean of Noyon Cathedral, and charged them with examining the Trial record to ascertain the facts about the trial.
Over the next several months, the Commission took testimony from 7 individuals including Jean Beaupère who had been one of the principal questioners of Joan at her earlier Trial. In addition to Beaupère, the Commission also heard testimony from 4 Dominican Friars, namely, Jean Toutmouillé, Ysambard de La Pierre, Martin Ladvenu, and Guillaume Duval, and two secular priests, Guillaume Manchon, who had served as chief notary at the original Trial, and Jean Massieu, who was the clerk to the Court Promoter, Jean d'Estivet.