Telesphorus was Bishop of Rome in the first half of the second century, reckoned in early lists as the seventh (or eighth, when Peter is counted) in succession from the Apostles. Of Greek ancestry, he was born at Thurii in Calabria in southern Italy — the site of present-day Terranova da Sibari — and his Greek name carries the sense of 'one who brings fruit to perfection.'
According to Eusebius of Caesarea, his episcopate began in the twelfth year of the reign of Emperor Hadrian (128–129) and ended in the first year of Antoninus Pius, a span conventionally given as roughly 126 to 137. The Liber Pontificalis records that he had lived as an anchorite before assuming the office of bishop.
He is remembered chiefly as a martyr: Irenaeus of Lyons, writing within living memory of the period, states that Telesphorus 'suffered a glorious martyrdom,' making him the first Bishop of Rome after Peter whom Irenaeus explicitly names as a martyr. He is commemorated on January 5 in the Roman and Orthodox calendars, and additionally on February 22 in the Greek tradition.