“Petrus Solus Auctoritatem Habet” is Latin for Peter alone has Authority.

The Delivery of the Keys, or Christ Giving the Keys to Saint Peter is a fresco by the Italian Renaissance painter Pietro Perugino which was produced in 1481–1482 and is located in the Sistine Chapel, Rome.
Many Protestants argue that Matthew 16:17-18 the rock is not Peter himself but the confession of Peter.
He said to them, “But who do you say that I am?” Simon Peter replied, “You are the Christ, the Son of the living God.” And Jesus answered him, “Blessed are you, Simon Bar-Jona! For flesh and blood has not revealed this to you, but my Father who is in heaven. And I tell you, you are Peter, and on this rock I will build my church, and the powers of death shall not prevail against it.
Catholic Biblical Association (Great Britain). (1994). The Holy Bible: Revised Standard Version, Catholic edition (Mt 16:15–18). National Council of Churches of Christ in the USA.
None of their exigencies matters because it is focused on the wrong passage. It doesn’t matter if you think the confession is the rock or Peter is. Because the verse doesn’t need Greek or Aramaic language to interpret it correctly.
The next sentence Jesus speaks to only Peter making it clear that Jesus is installing Peter as Prime Minister of His Kingdom, and that Jesus is taking away the Jewish priests ability to “bind and loosen” and giving it to Petert, which is the authority to interpret scripture and to speak on behalf of God in matter of righteous living.
Later in history and scripture, Jesus gives “binding and loosening” to the other apostles but to “Peter Alone” (Petrus Solus) does Jesus give his authority of the Kingdom of God by giving to Peter the Keys of the Kingdom.
Petrus solus auctoritatem habet
Saint Matthew 16:19
“I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven.”
Catholic Biblical Association (Great Britain). (1994). The Holy Bible: Revised Standard Version, Catholic edition (Mt 16:19). National Council of Churches of Christ in the USA.
