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A penitential is a book or set of church rules concerning the Christian sacrament of penance, a "new manner of reconciliation with God" that was first developed by Celtic monks in Ireland in the sixth century AD. It consisted of a list of sins and the appropriate penances prescribed for them, and served as a type of manual for confessors.

A penitential is a book or set of church rules concerning the Christian sacrament of penance, a "new manner of reconciliation with God" that was first developed by Celtic monks in Ireland in the sixth century AD. It consisted of a list of sins and the appropriate penances prescribed for them, and served as a type of manual for confessors.