16 When Pius II had become assured of these matters without delay, on October 7, 1462, he gave a letter to the bishop of the place in which he reproved and condemned such wickedness. Some time afterwards, Leo X lent, as far as he could, his good offices and authority to the kings of both Portugal and Spain, who took care to radically extirpate that abuse, opposed alike to religion, humanity, and justice. Nevertheless, that evil having grown strong, remained there, its impure cause, the unquenchable desire of gain, remaining. Then Paul III, anxious with a fatherly love as to the condition of the Indians and of the Moorish slaves, came to this last determination, that in open day, and, as it were, in the sight of all nations, he declared that they all had a just and natural right of a threefold character, namely, that each one of them was master of his own person, that they could live together under their own laws, and that they could acquire and hold property for themselves. More than this, having sent letters to the Cardinal Archbishop of Toledo, he prounounced an interdict and deprival of sacraments against those who acted contrary to the aforesaid decree, reserving to the Roman Pontiff the power of absolving them.(24)
Source: In Plurimis (Vatican.va)