Polycrates of Ephesus (//; Greek: Πολυκράτης; fl. c. 130 – 196) was an Early Christian bishop at Ephesus. Polycrates convened a synod to establish Quartodecimanism as the official position on Easter. His letter was written between 186-195 AD.
When Pope Victor wanted to set an official practice of Easter on the whole Christian world, to celebrate Easter on Sunday, Polycrates writing in the name of the entire Asian church, argued that the apostles taught to celebrate Easter on the 14th day of Nisan. In his letter he appeals to the authority of Polycarp of Smyrna, Thraseas of Eumenia, Sagaris, Papirius and Melito, all of whom were Quartodecimans.
- "Polycrates | bishop of Ephesus | Britannica". www.britannica.com. Retrieved 2022-05-24.
- "Fragments of Polycrates". www.earlychristianwritings.com. Retrieved 2022-05-24.
- "Polycrates of Ephesus (Wace information)". www.earlychristianwritings.com. Retrieved 2022-05-24.
- "CATHOLIC ENCYCLOPEDIA: Ephesus". www.newadvent.org. Retrieved 2022-05-24.