The final two letters of St. Ignatius which we read are both sent to the city of Smyrna. The first letter is sent to the Church as a whole, the second specifically to their bishop, Polycarp.
This first letter is special for many reasons, but particularly because it contains Ignatius’ clearest declaration of faith about the Eucharist, as well as being the earliest recorded use of the phrase “Catholic Church”. Invented at Nicea? I don’t think so.
Here is my abridged version of the letter:
“St. Ignatius of Antioch’s letter to the Smyrnaeans” PDF
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