a bishop of Rome, followed Pius I about 157, and is called a martyr in the Roman and other martyrologies, although it is not certain whether he shed his blood for the faith. He received, about 160, a visit from Polycarp, and tolerated the custom of the Asiatics in celebrating Easter on the fourteenth day of the first moon after the vernal equinox with the Jews. He had to combat the heretics Valentine and Marcion, and died 168. He is commemorated as a saint by the Roman Church on April 17. — Butler, Lives of the Saints, April 17.