What was the meeting of the Catholic Church leaders who banned the sale of indulgences?

Answer 1

There was no such meeting for the obvious reason that the sale of indulgences has never been permitted in the Catholic Church, that is called the sin of simony. In The Raccolta, there is an indulgence of 300 days issued for alms given to sacred Missions (that was last reprinted in 1957 with an Imprimatur of 1950. However, that was entirely superseded by the Enchiridion Indulgentiarum issued by the Sacred Apostolic Penitentiary in 1968 which contains no indulgences for alms directly, they would be covered under a general grant. The Council of Trent in 1563 issued the following decree on indulgences:

The Council of Trent

The Twenty-Fifth Session

The canons and decrees of the sacred

and oecumenical Council of Trent,

DECREE CONCERNING INDULGENCES.

Whereas the power of conferring Indulgences was granted by Christ to the Church; and she has, even in the most ancient times, used the said power, delivered unto her of God; the sacred holy Synod teaches, and enjoins, that the use of Indulgences, for the Christian people most salutary, and approved of by the authority of sacred Councils, is to be retained in the Church; and It condemns with anathema those who either assert, that they are useless; or who deny that there is in the Church the power of granting them. In granting them, however, It desires that, in accordance with the ancient and approved custom in the Church, moderation be observed; lest, by excessive facility, ecclesastical discipline be enervated. And being desirous that the abuses which have crept therein, and by occasion of which this honourable name of Indulgences is blasphemed by heretics, be amended and corrected, It ordains generally by this decree, that all evil gains for the obtaining thereof,--whence a most prolific cause of abuses amongst the Christian people has been derived,--be wholly abolished. But as regards the other abuses which have proceeded from superstition, ignorance, irreverence, or from what soever other source, since, by reason of the manifold corruptions in the places and provinces where the said abuses are committed, they cannot conveniently be specially prohibited; It commands all bishops, diligently to collect, each in his own church, all abuses of this nature, and to report them in the first provincial Synod; that, after having been reviewed by the opinions of the other bishops also, they may forthwith be referred to the Sovereign Roman Pontiff, by whose authority and prudence that which may be expedient for the universal Church will be ordained; that this the gift of holy Indulgences may be dispensed to all the faithful, piously, holily, and incorruptly.