Why did Pope Calixtus III order a new investigation into St. Joan of Arc’s trial?

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Pope Calixtus III ordered a new investigation into the trial of St. Joan of Arc in response to a formal petition submitted by the d’Arc family.1

Following this petition, proceedings were instituted between 1455 and 1456, which ultimately resulted in the revocation and annulment of her original 1431 conviction, thereby proclaiming her innocence.123