Of course there was no Roman Catholism unril about 300AD... surely you know that...
The Catholic Church started in 33 AD at Pentecost.
St. Peter (and St. Paul) went to Rome where both were martyred.
I don’t know why you’re seemingly hung up on the Roman Catholic Church. I follow the Church that Jesus Christ left for us, also known as the Catholic Church. Our Orthodox brethren are also part of the Catholic Church. Same beliefs, same creed and doctrine, different coloured drapes on the walls.
LOL! What is Roman Catholic? The earliest Apostolic Fathers (i.e. +Ignatius) speak of the catholic church and orthodox faith. The Eastern Church wa slikewise Roman. The Greek side of the Empire considered itself Roman, and the capital of the Roman Empire was even relocated to Constantinople, the New Rome. The Creed does not say "I believe in One Holy Roman Catholic Church" but "in One Holy Catholic and Apostolic Church."