Cerdo, another Gnostic and predecessor of Marcion of Sinope, also lived at Rome in the reign of Hyginus; by confessing his errors and recanting, he succeeded in obtaining readmission into the Church but eventually fell back into heresy and was expelled from the Church.Butler, Alban. "St. Hyginus, Pope and Martyr", The Lives of the Saints, vol.1, 1866Encyclopaedia Perthensis; Or Universal Dictionary of the Arts, Sciences, Literature, &c. Intended to Supersede the Use of Other Books of Reference, Volume 5The Complete Idiot's Guide to the Gnostic GospelsBy J. Michael MatkinSaint Clement, Pope and Martyr, and His Basilica in RomeThe Complete Dictionary of Arts and Sciences: In which the Whole Circle of Human Learning is Explained, and the Difficulties Attending the Acquisition of Every Art, Whether Liberal Or Mechanical, are Removed ... The Theological, Philological, and Critical Branches, Volume 2
