other · 155 · Rome
Polycarp kept Pascha on the fourteenth of Nisan, whatever day of the week it fell on, because that is how he had kept it with John and the rest of the apostles. Anicetus kept it on the Sunday, because that is how his predecessors had kept it. Neither could persuade the other and neither tried to compel, and Anicetus yielded the eucharist in his own church to Polycarp out of respect, and they parted in peace. Irenaeus, who tells it, was writing to Victor of Rome about forty years afterwards, when Victor was excommunicating the churches of Asia over the same question: the point of the story is that it had already been settled once by not settling it. A date has to be chosen and this dataset chooses 155, but Eusebius does not date the visit at all, Anicetus's accession is given variously as 154, 155 and 157, and the visit has to fall inside his episcopate and before Polycarp's death on 23 February. That is a tight fit, and the tightness is one of the reasons some scholars prefer Eusebius's own later date of 167 for the martyrdom.
To settle, or at least to survive, a disagreement about the day of Pascha that neither church would give up.
No agreement and no rupture: two customs, one communion, and a precedent Irenaeus threw at Pope Victor forty years later.