What were indulgences, as practiced prior to the reformation?

"The Catechism of the Catholic Church describes an indulgence as "a remission before God of the temporal punishment due to sins whose guilt has already been forgiven, which the faithful Christian who is duly disposed gains under certain prescribed conditions through the action of the Church which..." Wikipedia Wikimedia

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i'm asking the same thing i asked this other cat all of

to extend a country’s power and influence