John Calvin’s quote
John Calvin, Institutes of the Christian Religion, Book I, Chapter 13, Section 29:
“Nothing can be more nauseating, than the absurdities which have been published under the name of Ignatius; and therefore, the conduct of those who provide themselves with such masks for deception is the less entitled to toleration.”
Historian confirmation of Calvin’s view
W.D. Killen, The Ancient Church: Its History, Doctrine, Worship, and Constitution (1886). Killen notes that Calvin “did not hesitate to denounce the whole of them as forgeries.”
Martyrdom account
Martyrium Ignatii (also called Acta Ignatii or The Martyrdom of Ignatius), opening section: Ignatius is called “the disciple of John the Apostle, a man in all respects of an apostolic character,” and it states that both he and Polycarp had been disciples of St. John.
Eusebius on Ignatius as bishop
Eusebius of Caesarea, Ecclesiastical History, Book III, Chapter 22 and Chapter 36: Ignatius is described as the second bishop of Antioch in succession to Peter (after Evodius). Eusebius also records that Ignatius was sent to Rome and became food for wild beasts, and that he wrote letters while traveling under guard.
St. John Chrysostom
St. John Chrysostom, Homily on St. Ignatius (also titled On the Holy Martyr Saint Ignatius):
“He held true converse with the Apostles and drank of spiritual fountains” and “the hands of the blessed Apostles touched his sacred head.”
Theodoret on Peter appointing Ignatius
Theodoret of Cyrus (Cyrrhus), Dialogues (and referenced in his other historical/theological works): St. Peter himself appointed Ignatius to the episcopal see of Antioch.
Ignatius’ letter on the Eucharist (Real Presence)
Ignatius of Antioch, Letter to the Smyrnaeans, Chapter 7:
“…they abstain from the Eucharist and from prayer, because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which the Father, in his goodness, raised up again.”
Ignatius on Church structure and “the Catholic Church”
Ignatius of Antioch, Letter to the Smyrnaeans, Chapter 8:
“Follow the bishop, even as Jesus Christ does the Father… let no man do anything connected with the Church without the bishop. Wherever the bishop appears, there let the people be; even as, wherever Jesus Christ is, there is the Catholic Church.”
Ignatius on bishops throughout the world
Ignatius of Antioch, Letter to the Ephesians, Chapters 3–5:
“The bishops, settled everywhere to the utmost bounds of the earth, are so by the will of Jesus Christ” and warns against setting oneself in opposition to the bishop.
Ignatius on the Roman Church
Ignatius of Antioch, Letter to the Romans, Prologue/Salutation: The Roman church is described as the one “which holds the presidency of love” (or “presides in charity/love”).
Letter to the Romans, Chapter 4: “Not as Peter and Paul did, do I command you. They were Apostles.”
Ignatius’ final recorded words (“wheat of God”)
Ignatius of Antioch, Letter to the Romans, Chapter 4:
“I am the wheat of God. Let me be ground by the teeth of the wild beasts, that I may be found the pure bread of Christ.”