According to 2nd century church historians Eusebius and Iranaeus, Christians of the Roman province of Asia were called Easterners; while Christians of the church in Rome were called Westerners. The Easterners, also named Quarto-decimani’s, celebrated Passover beginning on the evening of the 14th day of the Aviv according to Deut. 16:1, while the Westerners celebrated Easter on Easter Sunday according to the decree of Roman Emperor, Constantine.
The leader of the church in Rome was heavily influenced by Rome’s political agenda; and made many attempts to persuade the church in Asia, to replace Yahovah’s feast of the Passover with the universal Easter celebration, on Easter Sunday, instituted by the Roman Emperor, Constantine. However, the Eastern Church led by Bishop Polycarp and later Bishop Polycrates, held fast to the teachings of TORAH and refused to make the switch.
Biblical scholarship supports that Yeshua was crucified in accordance with Deut. 16:1, as Yahovah’s Passover lamb, on 14th of the Aviv, calculated as Wednesday, April 5th, 30 A.D. Thus from the time of the first century Apostles to the end of the 2nd century, followers of Yeshua observed the Passover from the 14th day of the Aviv to the 21st day of the Aviv every year at its appointed time.
By the end of the 2nd century, a number of synods convened to address the differences in observance of the holy day between the churches of the east and west. Eusebius records: “Synods and conferences of bishops were convened and without a dissenting voice, drew up a decree of the Roman Catholic Church, in the form of letters addressed to Christians everywhere, that never on any day other than the Lord’s Day (Sunday) should the mystery of the Lord’s resurrection from the dead be celebrated, and on that day alone we should observe the end of the Paschal fast.”
Despite attempts made by the Western church leaders to excommunicate the Easterners or Quarto-decimani’s, their efforts failed when certain Easter-observing Westerners advocated that the church be tolerant and patient with the Passover-observing Easterners.
In the book, “Life of Constantine“, Eusebius tells us that at the First Ecumenical Council held in 325 AD at Nicaea, Emperor Constantine I, wrote a letter to all the Bishops not present at the meeting. He informed them of the unanimous decision of the Council to adopt a uniform date of, the Sunday, after the 14th day of the Aviv, to observe Easter, instead of the Jews celebration of Feast of Passover and Feast of Unleavened Bread.
Thus, all Christian churches in the Roman Empire discontinued observance of the 7th day Sabbath and the Feasts of Yahovah, God of the Jews. Emperor Constantine determined that the Sunday after the 14th of the Aviv would be the sole official date of observance. Thus, the custom of the Jews, was rejected by the universal church; and the Quarto-decimani who persisted in the original faith delivered to the first century saints were then persecuted for their defiance.