(In response to my wifes post.)
Well, maybe not EXACTLY, but pretty close....
"TERTULLIAN
It was in this Age that the first man to coin the word "Trinity" came along, named Tertullian (150 - 225 AD) and the first who said that God was Three persons in one substance about the year 200. Never before Tertullian had anyone heard of the word "Trinity". This man was originally "Binitarian" - having believed in two persons. He believed that the Holy Ghost was more of a "thing" and not God, Himself. But the "Montanists" taught him to believe in the Paraclete as being more personal than what he formerly felt. Thus the Holy Spirit became the third eternal person in his later thinking.
In his book Against Hermogenes, Tertullian believed God was originally alone and not yet, therefore, a Father. The Son was created at a certain point, making God into a Father. He wrote, "The Trinity, flowing down from the Father, does not at all disturb the Monarchy [one sovereign God], whilst at the same time guards the state of the Economy [three persons]," in his book Against Praxeas, a book which taught against Modalism or Oneness. He said that the Father and the Son are like the Sun and its light rays.
The light rays and the Sun are one, but yet they are two different things. He taught a new concept saying that the Son is merely "a portion of the whole Godhead".
He did not believe the three persons were eternal, as do the Trinitarians today.
ORIGEN
After Tertullian, came Origen (185 AD - 254 AD). This man derived much of his thoughts from pagan philosophy of the Greeks. He believed that souls pre-existed conception and that even Satan would eventually be saved. He believed Jesus was born of the Father before all other creatures, and that "the Holy Spirit was associated in honour and dignity with the Father and the Son. But in His case it is not clearly distinguished whether He is to be regarded as born or innate, or also as a Son of God or not," according to his book, On the Principles.
Origen was the first who clearly taught that there were three persons who were eternal. He taught that the Son eternally was being generated from the Father. (1:2:2; 1:2:4).
Towards the end of this Age, more and more writers began expressing their beliefs about God in trinitarian terms. Yet they still saw the Son and the Spirit as inferior to the Father. Only two men seemed to write in what is agreeable to the modern trinitarian doctrine. These men were Gregory Thaumaturgus and Dionysius of Rome.
Most of the Fourth Century passed before the orthodox Trinitarian doctrine was created. Please note that Trinitarianism was originated by people who did not believe in the absolute deity of Jesus Christ. Modern day Trinitarians do not even agree with what the originators of the Trinity believed!
By the end of the fourth century there was a great controversy between those who believed that Jesus was another being separate from God and inferior to God, and those who believed that Jesus was a coeternal person beside the Father making up one God. Athanasius led the group who believed in three persons while Arius led the other group.
In 325 AD, Athanasius' view won the day at the Nicean council. But the idea of a Trinity was not completely declared until the Council at Constantinople in 381 where they declared God to be three eternal persons. At this latter council they declared the Holy Spirit was a third eternal person. The Athanasian Creed is the declaration held by Roman Catholics and most Protestants today. It was created in the fifth century. Modern orthodox trinitarianism stands on this creed.
In order to accept the doctrine of the Trinity one must believe what the Roman Catholic Church teaches in their doctrine of Tradition and Magisterium. This doctrine declares that the Apostles did not have all the truths of God and that the "Church" formulated doctrines AFTER the Bible was written which are to be reckoned to be as important as the truths explicitly taught in the Bible. Since Trinity was not taught in the Bible, but formulated in the fourth century, it nevertheless must be believed since the "Church" said it was true."
Quote from:
http://www3.ns.sympatico.ca/mfblume/origin.htm