Polycrates of Ephesus

Polycrates of Ephesus (/pəˈlɪkrəˌtiːz/; Greek: Πολυκράτης; fl. c. 130 – 196) was an Early Christian bishop who resided in Ephesus.
Roberts and Donaldson noted that Polycrates "belonged to a family in which he was the eighth Christian bishop; and he presided over the church of Ephesus, in which the traditions of St. John were yet fresh in men's minds at the date of his birth. He had doubtless known Polycarp, and Irenaeus also. He seems to have presided over a synod of Asiatic bishops (A.D. 196) which came together to consider this matter of the Paschal feast. It is surely noteworthy that nobody doubted that it was kept by a Christian and Apostolic ordinance."
Polycrates is best known for his letter addressed to the Roman Bishop Victor who was attempting to find a consensus about the proper date to celebrate Easter, see also Quartodecimanism.
The Church historian Eusebius wrote,
A question of no small importance arose at that time. For the parishes of all Asia, as from an older tradition, held that the fourteenth day of the moon, on which day the Jews were commanded to sacrifice the lamb, should be observed as the feast of the Saviour's passover...But it was not the custom of the churches in the rest of the world...But the bishops of Asia, led by Polycrates, decided to hold to the old custom handed down to them. He himself, in a letter which he addressed to Victor and the church of Rome, set forth in the following words the tradition which had come down to him.
Here is what Eusebius records that Polycrates wrote,
We observe the exact day; neither adding, nor taking away. For in Asia also great lights have fallen asleep, which shall rise again on the day of the Lord's coming, when he shall come with glory from heaven, and shall seek out all the saints. Among these are Philip, one of the twelve apostles, who fell asleep in Hierapolis; and his two aged virgin daughters, and another daughter, who lived in the Holy Spirit and now rests at Ephesus; and, moreover, John, who was both a witness and a teacher, who reclined upon the bosom of the Lord, and, being a priest, wore the sacerdotal plate. He fell asleep at Ephesus. And Polycarp in Smyrna, who was a bishop and martyr; and Thraseas, bishop and martyr from Eumeneia, who fell asleep in Smyrna. Why need I mention the bishop and martyr Sagaris who fell asleep in Laodicea, or the blessed Papirius, or Melito the Eunuch who lived altogether in the Holy Spirit, and who lies in Sardis, awaiting the episcopate from heaven, when he shall rise from the dead? All these observed the fourteenth day of the passover according to the Gospel, deviating in no respect, but following the rule of faith. And I also, Polycrates, the least of you all, do according to the tradition of my relatives, some of whom I have closely followed. For seven of my relatives were bishops; and I am the eighth. And my relatives always observed the day when the people put away the leaven. I, therefore, brethren, who have lived sixty-five years in the Lord, and have met with the brethren throughout the world, and have gone through every Holy Scripture, am not affrighted by terrifying words. For those greater than I have said 'We ought to obey God rather than man'...I could mention the bishops who were present, whom I summoned at your desire; whose names, should I write them, would constitute a great multitude. And they, beholding my littleness, gave their consent to the letter, knowing that I did not bear my gray hairs in vain, but had always governed my life by the Lord Jesus.
Pope Victor attempted to cut off from the common unity Polycrates and others for taking this stance, but later reversed his decision after Irenaeus and others interceded. It is unclear what happened to Polycrates after his letter.
Polycrates' letter has been used as proof against the argument that the Churches in Asia Minor accepted the authority of the bishops at Rome.