The Catholic Church and Slavery: Truth, Repentance, and the Fight for Human Dignity

A Catholic defense of the Church on slavery cannot be fake history. It cannot pretend every Catholic was innocent, every Catholic institution acted heroically, or every pope spoke with perfect clarity from the beginning. That kind of answer does not defend the Church. It only defends a fantasy. The truth is harder, but it is also stronger, because Catholicism does not need lies to survive.

The Catholic Church carried within herself the doctrine that destroys slavery: every human person is created in the image of God, redeemed by Christ, and possessed of a dignity that cannot be reduced to ownership, profit, or merchandise. ^[1] But Catholics did not always live that truth clearly, consistently, or quickly enough. Pope Leo XIV says directly that the Church gradually came to a deeper awareness of the evil of slavery. He admits that many individuals and even ecclesiastical institutions had slaves in antiquity and the Middle Ages, and he says the Church’s full explicit recognition of slavery’s incompatibility with human dignity took eighteen centuries. ^[2]

So the Catholic answer cannot be, “No Catholic ever supported slavery.” That is false. The honest Catholic answer is that Catholic doctrine contains the principles that destroy slavery; many Catholics fought slavery, ransomed captives, and defended the oppressed; the Magisterium eventually condemned slavery absolutely; and where Catholics failed, the Church has asked pardon. ^[3] That is not a cover-up. That is Catholic honesty.

Scripture plants the seed that destroys slavery

The Bible begins with the truth that human beings are made in the image and likeness of God. ^[4] That means man is not a tool, an animal, an object, or a piece of merchandise. Genesis gives humanity dominion over animals and creation, but it does not give one human being the right to treat another human being as property. This distinction matters because every slave system depends on forgetting what man is. It depends on turning a person into a thing.

The Old Testament also condemns kidnapping and selling a human person. ^[5] That matters because systems built on kidnapping, trafficking, sale, and forced possession stand against a moral principle already present in Scripture. The Bible was not written inside a modern abolitionist society, and it does not pretend the ancient world was clean. But from the beginning, it gives truths that make the buying and selling of human beings impossible to justify once those truths are fully understood.

The New Testament goes even deeper. Saint Paul teaches that in Christ there is neither Jew nor Greek, slave nor free, male nor female, because all are one in Christ Jesus. ^[6] That verse did not instantly abolish Roman slavery as a civil institution, but it did destroy the religious idea that a slave and master had unequal dignity before God. Then Paul tells Philemon to receive Onesimus “no longer as a slave but more than a slave, a brother.” ^[7] Paul was speaking into a world where slavery was accepted by law, yet he identifies the slave as a brother in Christ. That is the root of the Catholic argument: human beings are not merchandise. They are persons made for God.

The early Church had the principles, but not yet the full explicit condemnation

The early Church lived inside the Roman world, where slavery already existed as a major social institution. Christians did not immediately abolish that entire system by civil law, and Pope Leo XIV explicitly warns us not to pretend the Church had full moral clarity on slavery from day one. ^[8] Still, the Gospel was already undermining slavery at the deepest level. The Church baptized slaves, taught that slave and free were one in Christ, and did not teach that a slave was spiritually inferior to his master. ^[9]

One of the strongest early Christian attacks on slave-owning came from Saint Gregory of Nyssa. In his fourth homily on Ecclesiastes, Gregory attacks the idea that one man can buy and sell another human being made in God’s image. ^[10] His argument is devastating because he asks what price someone can place on rationality and on the image of God. The answer is obvious: no price can be placed on the image of God. A man can buy land, animals, tools, or goods, but he cannot rightly buy another person as if that person were an object.

This is where Catholics have to be precise. The early Church had the principles that would destroy slavery, but the full explicit condemnation developed over time. That is not anti-Catholic. That is Pope Leo XIV’s own framing. ^[11] The Gospel was greater than the age, but many Christians were still trapped by the age. That tension is painful, but it is also true.

The medieval Church ransomed captives, but also shared the failures of the age

During the medieval period, the Church did real work to free captives. The Trinitarians were founded with a mission connected to ransoming Christian captives, and the Mercedarians were founded for the redemption of captive Christians. ^[12] This matters because the lazy anti-Catholic version of history acts as if the Church did nothing for captives or enslaved people. That is false. Catholics ransomed captives, Catholic religious orders were created for the redemption of captives, and Catholic theology praised manumission as an act fitting the dignity of man. ^[13]

But medieval Catholic society was not a perfect abolitionist society. Pope Leo XIV says that even ecclesiastical institutions had slaves in antiquity and the Middle Ages. ^[14] So the truth is not that Catholics always lived the Gospel perfectly. The truth is that the Church carried the Gospel through a wounded world, and Catholics often failed to apply its implications fully. That does not erase the Church’s work in ransoming captives, but it does prevent us from giving a dishonest version of history.

The colonial age shows both Catholic resistance and Catholic failure

The Age of Discovery is one of the hardest parts of this history. There was real Catholic resistance to enslavement. Pope Paul III’s Sublimis Deus in 1537 declared that Indigenous peoples and other peoples later discovered by Christians were not to be deprived of liberty or property and were not to be enslaved. ^[15] That is a real Catholic anti-slavery witness, and it directly attacks the idea that non-European peoples could be treated as beasts or natural slaves.

But there was also real Catholic failure. The Vatican’s 2023 statement on the “Doctrine of Discovery” says that the doctrine is not part of Catholic teaching. At the same time, the statement admits that certain papal bulls connected to colonial expansion did not adequately reflect the equal dignity and rights of Indigenous peoples, and that colonial powers manipulated those documents to justify immoral acts. ^[16] Pope Leo XIV goes even further. He says the Apostolic See, responding to rulers, intervened at times to regulate and legitimize forms of subjugation and, in certain cases, the enslavement of “infidels.” ^[17]

That is brutal, but it is necessary to say. The “Doctrine of Discovery” is not Catholic doctrine, and it is not the Gospel. But Catholics were entangled in colonial injustice. Catholic rulers used religious language to defend domination, and some Church authorities failed to oppose these injustices with enough clarity and force. This should grieve Catholics. It should not make us abandon the Church, but it should destroy triumphalism.

The modern Magisterium condemned slavery directly

By the nineteenth century, the Church’s condemnation of slavery became clearer and more absolute. Pope Leo XIV says that a formal, absolute, and universal condemnation of slavery was clearly articulated in the nineteenth century, notably under Pope Leo XIII. ^[18] Pope Leo XIII wrote In Plurimis in 1888 to the bishops of Brazil on the abolition of slavery. He said slavery was opposed to what God and nature originally ordained, and that God gave man dominion over animals, not the same kind of dominion over fellow human beings. ^[19]

Leo XIII also described ancient slavery as a system where slaves were treated not as persons, but as things. ^[20] This matters because the mature Catholic position is not that slavery is acceptable if the master is kind. The mature Catholic position is that reducing a person to property, profit, or merchandise is a sin against human dignity. A person can serve, work, obey legitimate authority, or suffer injustice, but no person can be reduced to a thing without violating the truth of what man is.

The Catechism and Vatican II leave no doubt

The Catechism of the Catholic Church directly condemns enslavement. It says the seventh commandment forbids acts or enterprises that lead to human beings being enslaved, bought, sold, and exchanged like merchandise. ^[21] The Catechism also says it is a sin against human dignity and fundamental rights to reduce people by violence to their productive value or to a source of profit. ^[22] That is the Catholic position today in plain language.

Vatican II called slavery, prostitution, the selling of women and children, and degrading working conditions “infamies.” The Council said these things poison human society and dishonor the Creator. ^[23] So the Catholic position is absolute: no human being may be treated like merchandise. Africans, Indigenous peoples, prisoners, migrants, workers, women, children, the poor, and the powerless all possess the same human dignity before God. Nobody is born to be owned, sold, trafficked, or reduced to profit.

Pope John Paul II, Pope Francis, and modern slavery

The Church also applies this teaching to modern slavery. Pope John Paul II called trafficking in human persons a shocking offense against human dignity and a grave violation of fundamental human rights. ^[24] Pope Francis made the fight against trafficking and modern slavery a major theme of his pontificate, and his 2015 World Day of Peace message was titled “No Longer Slaves, but Brothers and Sisters.” ^[25]

This matters because slavery did not vanish. It changed forms. Today slavery appears as human trafficking, forced labor, sexual exploitation, debt bondage, cartel exploitation, and economic systems that reduce human beings to profit. Catholic doctrine condemns all of it, because all of it attacks the same truth: the human person is not a product, machine, animal, or object. The person is made for God.

Pope Leo XIV’s apology matters

As of June 28, 2026, the clearest and most recent papal statement on this issue is Pope Leo XIV’s Magnifica Humanitas. Pope Leo XIV renews the Church’s firm condemnation of all forms of slavery, trafficking, and the commodification of persons. ^[26] He then tells the truth about Catholic history. He says the Church gradually came to a deeper awareness of slavery’s gravity. He says Catholics cannot deny or diminish the delay with which both society and the Church denounced slavery. He says even ecclesiastical institutions had slaves. He says the Apostolic See legitimized forms of subjugation and, in some cases, enslavement. He says slavery was long tolerated before being unequivocally condemned. ^[27]

Then Pope Leo XIV calls this a wound in Christian memory and asks pardon in the name of the Church. ^[28] That destroys both lies. The anti-Catholic lie says Catholic doctrine has no answer to slavery. That is false. The dishonest Catholic lie says there is nothing to repent of. That is also false. Pope Leo XIV gives the right posture: defend the truth, confess the sins, and fight modern slavery now.

So what is the Catholic answer?

When someone says, “The Catholic Church supported slavery,” the answer must be precise. Some Catholics supported slavery. Some Catholic institutions had slaves. Some Catholic rulers defended conquest and subjugation. Some papal documents were connected to colonial domination. Some Church authorities failed to oppose immoral acts with enough clarity and force. That is true, and Catholics should not be afraid to say it.

But it is false to say Catholic doctrine teaches that human beings may be treated as property. Catholic doctrine teaches that every human person is made in the image of God. Catholic doctrine teaches that slave and free are one in Christ. Catholic doctrine teaches that the Christian master must receive the slave as a beloved brother. Catholic doctrine teaches that human beings must not be bought, sold, or exchanged like merchandise. ^[29]

So the Catholic defense is not denial. The Catholic defense is truth. The Church carried the principles that destroy slavery, and Catholics also failed those principles too often. The Church fought slavery in real ways, and the Church also tolerated slavery too long. The Church now condemns slavery absolutely, and Pope Leo XIV has asked pardon for the Church’s complicity, blindness, and delay.

Conclusion: Christ is not defended by lies

The Catholic Church does not need fake history. The Gospel teaches that every person is made in God’s image. Saint Paul taught that slave and free are one in Christ. Saint Gregory of Nyssa attacked the buying and selling of human beings made in God’s image. Catholic orders ransomed captives. Popes condemned specific acts of enslavement. Vatican II condemned slavery as an infamy. The Catechism condemns buying and selling human beings like merchandise. Pope Leo XIV has asked pardon for the Church’s failures and delay.

So the Catholic answer is simple, but not simplistic. The Church had the truth that destroys slavery, but Catholics often failed that truth. The Church eventually spoke with full clarity, and now Catholics must fight every form of slavery that still exists. No human being is merchandise. No human being is property. No human being is a product, a machine, or a thing. Every human person is made in the image of God, loved by Christ, and called to eternal life. Any system that forgets that is not Catholic. It is sin.