Papal supremacy

Papal supremacy is the doctrine of the Catholic Church that the pope, by reason of his office as vicar of Christ, the visible source and foundation of the unity both of the bishops and of the whole company of the faithful, and as priest of the entire Catholic Church, has full, supreme, immediate and universal power and authority over the whole church, a power which he can always exercise unhindered.

The doctrine had the most significance in the relationship between the church and the temporal state, in matters such as ecclesiastic privileges, the actions of monarchs and even successions.

The Catholic doctrine of papal supremacy is based on the idea that it was instituted by Christ and that papal succession is traced back to Peter the Apostle in the 1st century. The authority for the position is derived from the Confession of Peter documented in Matthew 16:17–19 when, in response to Peter's acknowledgment of Jesus as the Messiah and Son of God, which many relate to Jesus' divinity, Jesus responded:

Blessed are you, Simon son of Jonah, for this was not revealed to you by flesh and blood, but by my Father in heaven. And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it. I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.

In his letter to Rome, Ignatius of Antioch says that the church at Rome "presides in the place of the region of the Romans" (προκάθηται ἐν τόπῳ χωρίου Ῥωμαίων).

Scholars such as Francis A. Sullivan say that there was no single "bishop" of Rome until well after the year 150 AD, and that there was no papacy for the first three centuries. Sullivan "expressed agreement with the consensus of scholars that available evidence indicates that the church of Rome was led by a college of presbyters, rather than a single bishop, for at least several decades of the second century."

Raymond E. Brown, while acknowledging the developmental aspect of bishoprics, did believe that early popes had high roles of authority among presbyters in Rome, and thus, it makes sense to speak of their successors.

Jesuit historian Klaus Schatz states that, "If one had asked a Christian in the year 100, 200, or even 300 whether the bishop of Rome was the head of all Christians, or whether there was a supreme bishop over all the other bishops and having the last word in questions affecting the whole Church, he or she would certainly have said no." He believes that this is because questions like these presuppose modern categories, which took time to develop. He goes on to explain how primacy was understood in the first centuries. He also believes it likely that "there very quickly emerged a presider or 'first among equals'".