When did the prohibition of marriage for priests in the Catholic church originate?

Question

The Bible mentions that one of the miracles Jesus performed was the healing of Peter's mother-in-law. This makes it quite clear that Peter himself was married, and Peter is the considered the first Pope by Roman Catholics. I've also heard that many if not all of the first popes were married and had families.

So, my question is this:

When was it that marriage first became prohibited for priests and popes in the Catholic church (for Latin Rite priests)?

And immediately he left the synagogue and entered the house of Simon and Andrew, with James and John. Now Simon’s mother-in-law lay ill with a fever, and immediately they told him about her. Mark 1:29-30 ESV

Answer 1

The important thing to consider is that celibacy, or practicing non-marriage, was practiced far before Christianity. Druid priests, Aztec Priests, etc were told to have been mandated to be pure and have no marriage with women.

I believe that the first written mandate that states that priests should be celibate was made around AD 300. The Council of Elvira stated that all "bishops, presbyters, and deacons and all other clerics were to abstain completely from their wives and not to have children".

This practice of celibacy began spreading in the Middle Ages. Around the 11th century Pope Benedict VIII issued a rule prohibiting the children of priests from inheriting property. A few decades later Pope Gregory VII issued a decree against clerical marriages.

It should be noted that Kings have used this as a weapon against the church's power. Since they could not have children, they could not pass the power to someone else. So it was the job of the king to decide who should be the next Pope.

As to why, maybe it was to make the people at the church to have a standing out quality that few other men had. It represented a paradigm of separation from the sinful world.

Answer 2

This article gives an overview of the history of celibacy in the clergy. Even the Catholic church would admit that celibacy was not enforced on clergy in New Testament times, but would point out that those who chose celibacy were held in high honour, even in that period. There is dispute over how early the rules of celibacy came to be enforced. The earliest enactment of a rule was around 300AD at the Spanish Council of Elvira. This was not a universal rule. The rules appear to have been gradually tightened over the next few centuries,:

[...] the synods of the sixth and seventh centuries, while fully recognizing the position of these former wives and according them even the formal designation of bishopess, priestess, deaconess, and subdeaconess (episcopissa, presbytera, diaconissa, subdiaconissa), laid down some very strict rules to guide their relations with their former husbands.

Even centuries after that the practice was not universal.

Answer 3

See "Priestly celibacy in patristics and in the history of the Church" by Roman Cholij or Card. Stickler's The Case for Clerical Celibacy: its historical development and theological foundations or the more recent Priestly Celibacy: Theological Foundations by Gary Selin.

Priests have always been prohibited to marry, all the way back to Apostolic times, in both the Eastern or Western Church.

Sometimes, though, married men have been permitted to become priests.

Answer 4

Introduction

When did the prohibition of marriage for priests in the Catholic church originate?

For those called who have made themselves eunuchs for the sake of the kingdom of heaven, they do so because they have been called to it and the joyfully receive it.

Mt 19:12(RSVCE)
12 For there are eunuchs who have been so from birth, and there are eunuchs who have been made eunuchs by men, and there are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven. He who is able to receive this, let him receive it.”[a]

Footnotes:
a. 19.11-12 Jesus means that a life of continence is to be chosen only by those who are called to it for the sake of the kingdom of God.

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As others have pointed out, it is a call to continence, of which celibacy is a subset, and the invitation is from the LORD himself, with the LORD himself setting the example.

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Answering the question

Please see: [Pope] Francis Speaks, Scalfari Transcribes, Brandmüller Shreds | Sandro Magister, in it, German Cardinal Walter Brandmüller is quoted as writing:

THE PRACTICE OF THE POST-APOSTOLIC CHURCH
The original form of celibacy therefore allowed the priest or bishop to continue his family life, but not his conjugal life. For this reason as well the preference was to ordain men who had reached an advanced age.

The fact that all of this can be traced back to ancient and sacred apostolic traditions is testified to by the works of ecclesiastical writers like Clement of Alexandria and the north African Tertullian, who lived in the 2nd-3rd century after Christ. Another witness of the high consideration bestowed on abstinence among Christians is a series of edifying tales of the apostles, the apocryphal 'Acts of the Apostles' composed in the 2nd century and widely read.

In the 3rd century the literary documentation on the abstinence of the clergy multiplied and became increasingly explicit, especially in the East. For example, here is a passage from the Syrian 'Didascalia': "The bishop, before he is ordained, must be put to the test to establish if he is chaste and has raised his children in the fear of God." The great theologian Origen of Alexandria (3rd century) also recognized the celibacy of abstinence as binding; a celibacy that he explains and explores theologically in various works. And obviously there are other documents that could be brought forward in support, something that obviously is not possible here.

THE FIRST LAW ON CELIBACY
It was the Council of Elvira in 305-306 that put this practice of apostolic origin into the form of a law. With canon 33, the Council prohibited bishops, priests, deacons, and all other clergy from having conjugal relations with their wives, and likewise prohibited them from having children. At the time it was therefore thought that conjugal abstinence was compatible with family life. Thus even the sainted pope Leo I, called Leo the Great, wrote around 450 that ordained men did not have to repudiate their wives. They were to remain together with them, but as if "they did not have them," as Paul writes in the first letter to the Corinthians (7:29).

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It should be noted that while these kind of questions always point to the fact that Peter was married, they fail to record that it is the constant Tradition of the Church that St. John the Apostle and Evangelist was never married. Nor can the say whether as married, Peter continued with his conjugal life after a certain point after following Jesus.

And there is Jesus.

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Endnote

Cardinal Brandmüller ends by writing:

[I]t must be taken into account that celibacy, just like virginity in the name of the Kingdom of Heaven, will always be troublesome for those who have a secularized conception of life. But as Jesus said in this regard: “He who is able to receive this, let him receive it.”

It is said that among those who understand and appreciate continency for the sake of the Kingdom, are the married who strive for holiness in their vocation, and vice versa, it is the saintly priests among those who understand and appreciate the calling to sacramental matrimony.

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Please see also:

• Celibacy of the Clergy | New Advent.
• Celibacy and Priesthood | Cardinal William Levada.
• Priestly celibacy in patristics and in the history of the Church | Roman Cholij. [cf. Geremia's answer].