Dum Diversas opened the door. Romanus Pontifex walked through it and built a house.
Three years after Pope Nicholas V authorized Portugal to reduce non-Christians to perpetual slavery, he issued a second document. This one went further. Where Dum Diversas had been a general authorization — a theological permission slip for conquest — Romanus Pontifex, issued January 5, 1455, was an operational charter. It named specific geography. It granted specific monopolies. It described specific human beings already being held in bondage and declared their enslavement just and lawful. And it established, for the first time in explicit written form, that the lands and peoples of sub-Saharan Africa were the permanent property of the Portuguese crown — to do with as they saw fit, in perpetuity, in the name of God.
The document acknowledged, without shame, what was already happening. It noted that Portuguese sailors had already traveled to the coast of Guinea and beyond. It noted that they had already taken captives — “many Guineamen and other Negroes, taken by force, and some by barter.” It noted that some of these captives had been baptized into the Catholic faith. And rather than using that baptism as a reason to free them — which earlier Church doctrine might have suggested — Nicholas V used it as evidence that the enterprise was working. Souls were being saved. The slave trade was a missionary operation. God was pleased.
This was not theology. This was accounting dressed in vestments.
The bull granted Portugal an exclusive monopoly over all trade, navigation, and conquest along the African coast from Morocco south to Guinea and beyond — to India, if they could reach it. It explicitly prohibited any other Christian nation from entering these waters or conducting this trade without Portuguese permission. It declared that anyone who violated this monopoly would face excommunication. The slave trade had been given not just theological blessing but corporate protection — a papal patent on the trafficking of human beings.
What Romanus Pontifex established in 1455 became the template for everything that followed. When Spain sought the same authorization for its westward conquests after 1492, it went to Rome. Pope Alexander VI issued Inter Caetera in 1493, dividing the non-Christian world between Spain and Portugal along a line of longitude — Spain to the west, Portugal to the east. The Treaty of Tordesillas in 1494 ratified this division between the two crowns. The entire Western Hemisphere and the entire African continent had been allocated by papal decree to two European kingdoms, neither of which had ever set foot in most of what they were claiming.
The people living in those places were not consulted.
Romanus Pontifex contains one passage that deserves to be read slowly, because it states the logic of the entire enterprise with unusual clarity. It describes the goal of Portuguese expansion as bringing “the said barbarous nations to the Catholic faith” — but then immediately pivots to the commercial objectives: the seizure of their goods, their lands, and their persons. The faith was the justification. The goods were the point. The Church knew the difference and signed the document anyway.
Priests were stationed inside Portuguese slave forts built on the West African coast — at Elmina, at Arguim, at a dozen other locations. Their job was to baptize the captives before they were loaded onto ships. Baptism did not free them. It did not protect them. It did not change anything about the conditions of their captivity or the violence of the Middle Passage that awaited them. It simply gave the Church a record — a tally of souls saved — that could be presented as evidence of holy work.
The original document of Romanus Pontifex is held in the Vatican Secret Archives. It has never been destroyed. It has never been hidden. For nearly six centuries it sat in Rome as a monument to what institutional power looks like when it decides that some human beings are resources rather than people.
On March 30, 2023, the Vatican — under Pope Francis — issued a formal repudiation of the Doctrine of Discovery, the theological framework built on Dum Diversas and Romanus Pontifex. The statement acknowledged that the papal bulls had been used to justify “violence, dispossession, and enslavement.” It called them “not part of the Catholic faith.” It did not use the word apology.
Five hundred and sixty-eight years.