The triads or "trinity" of gods has a long history, such as ancient Egypt some 3,500 years ago as the first world power of Bible prophecy (Isa 52:4a), that had its triad of Osiris (father), Isis (Osiris wife, mother) and Horus (their son).
Assyria as the second world power of Bible prophecy (Isa 52:4b, from about 9th to the 7th centuries B.C.E.), though having its national god of Asshur (that is seen with three heads discovered on a seal in the ruins of an Assyrian palace by English archaeologist A. H. Layard from 1845-51 C.E.), had its triad of gods, such as Aner (representing heaven where birds fly), Bel (representing the earth where man and the animals live), and Ea (representing the watera where fish and other aquatic animals live).
Another triad was that Sin (the moon-god), Shamash (the sun-god), and Rammah (the god of storm, that was often replaced with the fertility goddess Ishtar, a Babylonian goddess, as queen of the stars or "heavens", being absorbed from ancient Babylon, for ancient Babylon was "a land of graven images", Jer 50:1, 38), that had infiltrated the Israelites worship of Jehovah (God's name, see Ex 6:3, KJV) God, as can be seen at 2 Kings 23:5, 11.
By the time Jesus arrived on the earth as the promised Messiah in 29 C.E., ancient Rome was rife with pagan worship. With Augustus Caesar being proclaimed the first "Pontifex Maximus" or "chief priest" of the Roman Empire in 12 B.C.E., this pushed paganism to greater heights.
It saw the observance of Saturnalia, a festival that ran from December 17-24, whereby slaves were temporarily freed and gifts were given and then on December 25, it celebrated "the birthday of the invincible sun", of the Persian god of light, Mithra, that was absorbed by the newly created Catholic (meaning "1. all-inclusive: 2. useful to all: 3. all-embracing:", Microsoft Encarta Reference Library 2005, embracing pagan religious ideologies and "Christianizing" them) church, that has been "Christianized" as Christmas.
Ancient Rome also had it own triad of gods, such as Jupiter (ruler of the gods, the son of the god Saturn), Juno, and Minerva, so that "with the goddesses Juno and Minerva, Jupiter formed the triad whose worship was the central cult of the Roman state."(Microsoft Encarta Reference Library 2005)
By the 4th century C.E., the subject of who God and Jesus is, was a "hot topic" and was causing "fractures" within Roman society, so that Roman Emperor Constantine convened the Council of Nicaea in 325 C.E to "settle" the issue (which it did not).
By 451 C.E., at the Council of Chalcedon, the "Holy Trinity" was now complete when the holy spirit was added "in the mix" as the "third person of the Holy Trinity", in which so-called "Christianity" (or the beginning of Christendom as "the antichrists", that means "against (or instead of) Christ", at 1 John 2:18-23, that was developing while the apostle John was alive, replacing true Christianity with their false Christianity, the "weeds" at Matthew 13:24-30, counterfeit Christians), absorbed (or reflected) it from pagan Rome's trinity.
So, "the Holy Trinity" was a culmination of counterfeit Christians, creating their own form of worship that tries to give the impression that it is genuine, when, in fact, it is counterfeit, just as counterfeit money can fool the vast majority of people, unless they are trained to distinguish counterfeit money from genuine money.
Thus, the realm of Christendom has been fooled with its counterfeit "theology", with its "Holy Trinity", for John 1:1, 2 reads of Jesus, according to the Codex Vaticanus of about 350 C.E., that predates the King James Bible by some 1,261 years: "In a beginning was the Word, and the Word was with the God. And a god was the Word. This was in a beginning with the God."(Emphatic Diaglott, pub in 1864 C.E.)
