Mass of Saint Gregory

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The Mass of Saint Gregory is a subject in Roman Catholic art which first appears in the late Middle Ages and was still found in the Counter-Reformation. Pope Gregory I (c. 540–604) is shown saying Mass just as a vision of Christ as the Man of Sorrows has appeared on the altar in front of him, in response to the Pope's prayers for a sign to convince a doubter of the doctrine of transubstantiation.

A rare sculpted version of the Mass. German, 1480.