You're playing fast and loose with words. You just erased 30 years. I said before Tertullian's maturity, which I placed at 30 years of age, not at his birth. That is a slight of hand.
I said it was being defended within the fledgling churches. You changed that to "firmly established."
When you change the goal posts, you're being less than honest.
The obvious starting place would be within the New Testament, which was established in 30A.D., sixty five years before the Apostle John wrote "Revelation," to complete it, but knowing your disdain for Holy Scripture, here are four individuals and six statements after God's Word closed.
Here's three from Ignatius (30 A.D.-107 A.D.), one from Polycarp (70-155/160), one from Justin Martyr. (110 A.D.-165 A.D.), and one from Irenaeus (115-190A.D.)
Quotes from the Early Church Fathers: on the Trinity
The following are excerpts of trinitarian doctrines found in the early church fathers writings, after the apostles had departed this earth, and gone home.
Ignatius a.d. 30–107
Since, also, there is but one unbegotten Being, God, even the Father; and one only-begotten Son, God, the Word and man; and one Comforter, the Spirit of truth; and also one preaching, and one faith, and one baptism;
The Epistle of Ignatius to the Philadelphians Chapter IV
But the Holy Spirit does not speak His own things, but those of Christ, and that not from himself, but from the Lord; even as the Lord also announced to us the things that He received from the Father. For, says He, “the word which ye hear is not Mine, but the Father’s, who sent Me.” And says He of the Holy Spirit, “He shall not speak of Himself, but whatsoever things He shall hear from Me.” And He says of Himself to the Father, “I have,” says He, “glorified Thee upon the earth; I have finished the work which, Thou gavest Me; I have manifested Thy name to men.” And of the Holy Ghost, “He shall glorify Me, for He receives of Mine.”
The Epistle of Ignatius to the Ephesians Chapter IX
For if there is one God of the universe, the Father of Christ, “of whom are all things;” and one Lord Jesus Christ, our [Lord], “by whom are all things;” and also one Holy Spirit, who wrought in Moses, and in the prophets and apostles;
The Epistle of Ignatius to the Philippians Chapter I
Polycarp (70-155/160). Bishop of Smyrna. Disciple of John the Apostle.
"O Lord God almighty . . . I bless you and glorify you through the eternal and heavenly high priest Jesus Christ, your beloved Son, through whom be glory to you, with Him and the Holy Spirit, both now and forever" (n. 14, ed. Funk; PG 5.1040).
Justin Martyr a.d. 110–165
For, in the name of God, the Father and Lord of the universe, and of our Saviour Jesus Christ, and of the Holy Spirit, they then receive the washing with water.
The First Apology Chapter LXI
Irenaeus (115-190A.D.). As a boy he listened to Polycarp, the disciple of John. He became Bishop of Lyons.
"The Church, though dispersed throughout the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: . . . one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who proclaimed through the prophets the dispensations of God, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the ascension into heaven in the flesh of the beloved Christ Jesus, our Lord, and His manifestation from heaven in the glory of the Father ‘to gather all things in one,' and to raise up anew all flesh of the whole human race, in order that to Christ Jesus, our Lord, and God, and Savior, and King, according to the will of the invisible Father, ‘every knee should bow, of things in heaven, and things in earth, and things under the earth, and that every tongue should confess; to him, and that He should execute just judgment towards all . . . '" (Against Heresies X.l)
Canuckus Deploracus wrote:
Sources please...Just one... That espoused the Trinity doctrine before Tertullian... Should be hordes of them if the Trinity was firmly established almost a hundred years before his birth...
Just one...