Did Those Assemblies Claim Their Fourteenth-day Practice Came from Earlier Followers?
Witness: Eusebius, Ecclesiastical History 5.24 · Person: Polycrates of Ephesus · late 2nd c.
What the ancient record says
Polycrates, a leader in Asia, defended the fourteenth-day observance when Rome challenged it; Eusebius preserves part of his letter. He argues it was inherited, not recent, appealing to earlier followers who observed the same day, naming Philip, John, Polycarp, Thraseas, Sagaris, Papirius, and Melito as predecessors associated with the observance.
He says all observed the fourteenth day of Pasakh, according to the Besorah and the rule of Amunah. Historical claim: his community believed its practice inherited from earlier generations.
Naming John does not by itself prove John personally authored it, distinguish "Polycrates says John observed it" from an independent first-century confirmation (which we do not have); evidence level = important late-2nd-century testimony claiming earlier apostolic-era continuity. Polycrates says he came from a family with multiple assembly leaders, part of an inherited local tradition, not inventing a controversy.
Read it for yourself. Eusebius, Ecclesiastical History 5.24 (Polycrates's letter; the fourteenth day + the list).
Evidence strength: Very strong for the 2nd-century claim of inherited continuity. Proven: he defended the fourteenth day; named earlier figures. Caution: each predecessor's practice is known here through Polycrates's testimony.