The One Catholic Church is a full communion of self-governing Churches, with the Church of Rome holding Primacy among the Churches.
In
Acts 2:5-11, we read that the Gospel was preached to every nation under heaven:
Now there were dwelling in Jerusalem Jews, devout men from every nation under heaven. And at this sound the multitude came together, and they were bewildered, because each one heard them speaking in his own language. And they were amazed and wondered, saying, "Are not all these who are speaking Galileans? And how is it that we hear, each of us in his own native language? Par’thians and Medes and E’lamites and residents of Mesopota’mia, Judea and Cappado’cia, Pontus and Asia, Phryg’ia and Pamphyl’ia, Egypt and the parts of Libya belonging to Cyre’ne, and visitors from Rome, both Jews and proselytes, Cretans and Arabians, we hear them telling in our own tongues the mighty works of God.
The one I bolded is us, the people of Mesopotamia (modern day Iraq). We are in full communion with everyone else including the Church of Rome, the martyrdom site of Sts. Peter and Paul, which holds Primacy among all the Holy Catholic Churches around the world.
We were never in the Roman empire, rather, we were in the Persian empire. We are Eastern Catholics, not Roman Catholics, but Eastern Catholics in full communion with the Universal Church, including the Holy Church of Rome, which presides in charity and confirms the brethren in the Faith.
Our liturgical prayers during the feast of Sts. Peter and Paul say the following:
Blessed are you, O Rome, renowned city of kings,
handmaid of the heavenly Bridegroom!
For the two true preachers are laid up in you as in a harbor:
Peter, the head of the apostles,
upon whose truth our Savior built his faithful church,
and Paul the elect, apostle and builder of the churches of Christ.
By their prayers we find refuge,
that mercies and compassion may be granted our souls.
Again, these prayers, prayed for the City and Church of Rome, are coming from the people of Assyria and Babylon, the people of the great land of Mesopotamia, from whom
Abraham was called out of Ur of the Chaldeans, and where
Jonah prophesied to Nineveh of the Assyrians.
We love the Pope of Rome, first among the bishops, with whom we are in full communion, and we love all the Patriarchs and Bishops of the Holy Catholic Church with which we are in full communion of peace and charity.
God bless,
Rony