Peter was the first among equals, the first among the Twelver.. I like to show this by starting with Scriptural proofs. Afterwards, I'll show historical proof.
Scriptural Tradition: In the Douay Rheims the verse reads as follows:
And Jesus came into the quarters of Cæsarea Philippi: and he asked his disciples, saying: Whom do men say that the Son of man is? But they said: Some John the Baptist, and other some Elias, and others Jeremiah, or one of the prophets. Jesus saith to them: But whom do you say that I am? Simon Peter answered and said: Thou art Christ, the Son of the living God.
As you might know, Caesarea Phillippi is in the valley of Lebanon below Mount Hermon as mentioned in Josh 11:17 or Baal Hemon as mentioned in Judg 3:3. Of particular interest is a land feature of a massive rock face. One of the tributaries for the Jordan River flows through the area. The area was liberated by the Maccabean revolt in 167 B.C. In 4 B.C. one of Herod the Great s three sons, Philip, built the Roman Grecian of Caesarea Philippi to honor the Roman emperor.
If you will, imagine Jesus with this huge rock wall as a backdrop; he asked twice (not once but twice), “Whom do they say that I am?” None of the disciples could give the answer except Simon. Simon confessed Jesus as being both the Messiah and the “Son of the Living God.” God had revealed.
And Jesus answering said to him: Blessed art thou, Simon Bar-Jona: because flesh and blood hath not revealed it to thee, but my Father who is in heaven. And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it.
I can’t claim any significance to the number of times “blessed art thou” is used in the New Testament. However, it is used only three times, twice in Luke 1: 42, and once in Matthew 16:17. It’s only used once by Jesus.