Traditionally bishop of Rome after Peter and Linus but before Clement, and a martyr of the late 1st century. Nothing is known of him for certain, but the division of Rome into twenty-five parishes is dubiously ascribed to him. Formerly mentioned in the Roman Canon, his feast, with that of Marcellinus, was kept until 1969 on 26 April.
L. Duchesne, Liber Pontificalis (2 vols., 1886–92), especially i. lxix–lxx; B.T.A., ii. 163–4;O.D.C.C., s.v.