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What role did indulgences play in the medieval Roman Catholic penitential system?

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Anastasis (Christ ascending from hell), apse fresco, c. 1320; in the Church of the Holy Saviour at the Monastery of the Chora (now the Kariye Museum), Istanbul. — purgatory *Anastasis* (Christ ascending from hell), apse fresco, c. 1320; in the Church of the Holy Saviour at the Monastery of the Chora (now the Kariye Museum), Istanbul.

In the medieval Roman Catholic penitential system, indulgences served as a mechanism to remit the temporal punishment (poena) remaining after the guilt of sin had been forgiven through absolution and confession.1

This system was fundamentally linked to the belief in purgatory, a state where the soul could satisfy the debt of sin through suffering. Indulgences allowed the faithful to amortize this debt through good works, such as pilgrimages or charitable acts, or by drawing upon the Treasury of Merit—a store of spiritual merits accumulated by Jesus Christ and the saints, which the pope could distribute.12

While intended to aid in salvation, the system became increasingly associated with the commutation of obligations into monetary payments. This practice led to significant abuses, such as the "sale" of indulgences, which became a focal point of criticism during the Reformation. Ultimately, the Council of Trent condemned the financial exploitation of the system, though it maintained the theological validity of indulgences within the Church.12