first pope?

Question

There must've been a first Pope...
Did he simply just come out of the woodwork and declare:
"Yeah, so, I'm the Pope now, like, God talks to me and stuff..."?
Somehow, no one dared to question this authority for however many centuries.

Answer 1

John 21:15-17 states:

When they had finished breakfast, Jesus said to Simon Peter, "Simon, son of John, do you love me more than these?" He said to him, "Yes, Lord, you know that I love you." He said to him, "Feed my lambs."

He then said to him a second time, "Simon, son of John, do you love me?" He said to him, "Yes, Lord, you know that I love you." He said to him, "Tend my sheep."

He said to him the third time, "Simon, son of John, do you love me?" Peter was distressed that he had said to him a third time, "Do you love me?" and he said to him, "Lord, you know everything; you know that I love you." (Jesus) said to him, "Feed my sheep.

Matthew 16:17-19 states:

Jesus said to him in reply, "Blessed are you, Simon son of Jonah. For flesh and blood has not revealed this to you, but my heavenly Father. And so I say to you, you are Peter, and upon this rock I will build my church, and the gates of the netherworld shall not prevail against it. I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven."

The Catholic Church believes the Lord made Simon alone, whom he named Peter, the "rock" of his Church. He gave him the keys of his Church and instituted him shepherd of the whole flock.

The Pope is the senior pastor of 1.1 billion Catholics, the direct successor of Simon Peter.

With love in Christ.

Answer 2

"Thou art Peter, and upon this rock I will build my church." Peter.