The Quartodecimans argued that Christians should observe only the 14th as the Passover supper and Eucharist mystery (cup and bread) because the messiah and his disciples kept that same day.
Nevertheless, there was strong resistance by the Roman assembly.
The Quartodeciman (System A) and Quasi-Quartodeciman (System D) practice was made more difficult to overcome by the fact that they were both based upon the same apostolic authority (the apostle John).1
It soon became obvious that if the Roman assembly was to gain political dominance in the West, as well as over many of the eastern assemblies, a new strategy was required.
In response, during the last decade of the second century C.E., the western leaders and theologians developed a new approach: the Roman assembly Passover and, after the Council of Nicaea in 325 C.E., canonized as the Roman Catholic Passover (System E).