"PETRVS"

The statue of "PETRVS" in the photo below is outside the cathedral across from Madrid's royal palace.

Now when Jesus came into the district of Caesarea Philippi, He was asking His disciples,

"Who do people say that the Son of Man is?"
And they said,

"Some say John the Baptist; and others, Elijah; but still others, Jeremiah, or one of the prophets."
He said to them,

"But who do you say that I am?"
Simon Peter answered,

"You are the Christ, the Son of the living God."
And Jesus said to him,

"Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven. I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven."

[Matt 16:13-19]

Catedral de la Almudena.