Zosimus

Zosimus was bishop of Rome from 18 March 417 until his death on 26 December 418, a pontificate of less than two years. The Liber Pontificalis describes him as a Greek (natione Graecus) and names his father Abram; neither a precise birthplace nor a birth year is recorded in contemporary sources, and later local claims associating him with Mesoraca in Calabria are not securely attested in early evidence. He succeeded Innocent I. Almost nothing is known of his career before his election. His brief reign is documented mainly through papal letters and through the reactions of the churches of Africa and Gaul, which show a pope determined to assert Roman appellate and metropolitan authority, sometimes on contested canonical grounds.

The most famous episode of the pontificate is Zosimus’s handling of Pelagianism. After Caelestius, a leading associate of Pelagius, came to Rome and submitted a profession of faith, Zosimus initially judged the case more favourably than the African bishops had done and wrote to Africa in terms that appeared to reopen the question. Augustine of Hippo and the African episcopate, who had already condemned Pelagian teaching at councils including Carthage, protested vigorously and sent further documentation. Confronted with that dossier and with the persistence of the African synods, Zosimus reversed course. He issued a circular letter commonly called the Tractoria (or Epistola tractoria), requiring bishops to subscribe to the condemnation of Pelagius and Caelestius. The episode illustrates both the still-fluid procedures of doctrinal adjudication between Rome and the African church and the eventual alignment of the Roman see with the anti-Pelagian consensus that Innocent I had already favoured.

Zosimus also intervened heavily in the organization of the church in Gaul. He granted wide metropolitan privileges to Patroclus, bishop of Arles, including a right of oversight over a large part of southern Gaul and a role as intermediary for Gallic clergy dealing with Rome. This elevation of Arles provoked resistance from other Gallic bishops, notably Proculus of Marseille, and the arrangement did not outlast Zosimus in a stable form. In Africa he became involved in the case of Apiarius of Sicca, a priest who appealed to Rome after deposition. Zosimus sent legates and cited canons which he presented as Nicene but which were in fact canons of the Council of Serdica concerning appellate rights. The African bishops challenged the citation and defended their own disciplinary autonomy, producing a prolonged dispute over Roman appellate jurisdiction that continued under Zosimus’s successors.

Zosimus died in Rome on 26 December 418 and was buried, according to the Liber Pontificalis, on the Via Tiburtina in the cemetery of Cyriaca, near the body of the martyr Lawrence—the site associated with the later Basilica of Saint Lawrence outside the Walls. His death was followed by a contested succession between Eulalius and Boniface I. Later martyrologies commemorate him on 26 December. He was venerated as a saint in the traditional Roman lists of popes; there was no later formal process of canonization of the medieval or modern type. Historians generally treat his pontificate as short, poorly documented outside a handful of controversies, and marked by an assertive but not always well-informed use of Roman authority in Gaul and Africa.