Regarding the Roman construct (System E) of the Festival of Passover and Unleavened Bread, we will now address the protagonists of this Christian Hasidic practice who opposed the Quartodecimans (System A) and the Quasi-Quartodecimans (System D).
Irenaeus
Irenaeus (c.140-202 C.E.), presbyter and bishop of the diocese of Lyons, Gaul (France),1 was a vital player in the formulation of this new Roman assembly view.
Though early in his life he lived in Asia among the Quartodecimans and personally knew Polycarp, in his adult life he helped direct the western assemblies toward their new path.2