When was the church first called Roman Catholic?

Was the Roman Catholic Church the first church?

The Catholic Church is the oldest institution in the western world. It can trace its history back almost 2000 years.

What came first Christianity or Catholicism?

By its own reading of history, Roman Catholicism originated with the very beginnings of Christianity. An essential component of the definition of any one of the other branches of Christendom, moreover, is its relation to Roman Catholicism: How did Eastern Orthodoxy and Roman Catholicism come into schism?

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