Tuesday, August 11, 2026

Geoffrey D. Dunn on Pope Zosimus (417-418) and His Actions During the Pelagian Controversy

  

Zosimus

 

Things took a dramatic turn under Innocent's successor, Zosimus (417-418). Almost immediately, Caelestius agreed to follow up the appeal he had demanded back in 411 by turning up in Rome before a gathering of Zosimus and his clergy.

 

We could say that Zosimus was concerned with procedural fairness, following not only Roman law (Dalmon 2009) but the scriptural example of Daniel examining the accusers of Susannah (Dan. 13). After all, Pelagius and Caelestius had been exonerated at the preliminary hearing in Jerusalem and at the synod in Diospolis, and Zosimus' predecessor had condemned them without giving them a personal hearing or chance to defend themselves. In September 417, Caelestius appeared at San Clemente in Rome, the details of which we know from a letter Zosimus sent to the Africans (Ep. 2 = Collectio Avellana, Ep. 45; following the CSEL numbering of sections of this letter) and from rather forced comments later made by Augustine, who felt the need to defend Zosimus against criticism from Julian of Aeclanum, even though he was far more critical of Zosimus at the time (De gr. Chr. et de p. o. 2.6.7-2.7.8; C. duas epp. Pel. 2.3-5-2.4.6; Lamberigts 1992: 312-317; 2004: 374; Carefoote 1995: 212).

 

The letter reveals that Caelestius had not come to Rome to fulfil Innocent's demands that he repudiate his views and seek forgiveness (Burns 1979 ), but to have Innocent's decision overturned (Ep. 2.2). He was not asking for clemency or pardon; he was appealing against the initial verdict, and Zosimus was satisfied enough to rescind it (Dunn 2013). Zosimus pointed out to the Africans that he questioned Caelestius extensively on his recent confession of faith (Ep. 2.3; van Egmond 2011). I do not think that Caelestius showed how much he had emended his views (Lamberigts 1992: 319; Carefoote 1995: 186) but explained satisfactorily how his views in fact agreed already with what Innocent required and that he had been condemned unfairly. This was possible because, in all likelihood, the Roman bishops did not share the theological sensitivities about original sin and the baptism of infants held by the Africans (Wermelinger 1975: 138-139 ). Caelestius might not have needed to be too explicit in what he really believed to satisfy Rome.

 

Zosimus was also concerned that the Africans had not condemned Caelestius in 411 when he was present but had done so in 416 in his absence, all too hastily and after having been persuaded by Heros and Lazarus, individuals he found disreputable (Ep. 2.4-7; see Dunn 2015a, 2015b, 2016a). Zosimus challenged the Africans to find fault with Caelestius' confession of faith within the next two months (Ep. 2.8) or let it lapse, since it did no one any good to quibble over words out of an endless curiosity rather than follow Scripture (Ep. 2.9). He certainly saw himself as an impartial arbitrator and not a Pelagian sympathizer. He asserted Rome's authority quite firmly in the letter, also employing Innocent's image of Rome as a spring (Ep. 2.1).

 

Pelagius too had written to Innocent, but it was received only by Zosimus (Pelagius, Libellus fidei; Augustine, De g. Chr. et de p. o. 30.32; van Egmond 2007, 2012) after Caelestius' appeal was upheld. Zosimus wrote again to the Africans (Ep. 3 = Collectio Avellana, Ep. 46). Having read Pelagius' statement of faith, he found it to be much like Caelestius' and therefore acceptable (Ep. 3.3). Much of the vitriol in the letter is directed against Heras and Lazarus (Ep. 3-4-8). The sense again is of Zosimus' concern that procedural fairness had not been observed by the Africans (Ep. 3.10).

 

Further reaction from the Africans and Zosimus, including the latter's March 418 letter (Ep. 12 = Collectio Avellana, Ep. 50) again justifying his procedures in response to an African synod in November 417 and the African synod of May 418, has been analysed by Wermelinger (1975: 146-152), Ocker (1991), Carefoote (1995: 213-218), and Marcos, Chapter 6, this volume.

 

While Zosimus could wrangle with the African bishops all he liked, he could not resist the full force of imperial law, once it became involved in April 418 thanks to the savvy manoeuvring by the Africans. It is clear that Zosimus needed to align himself with the imperial position. This he did by the middle of the year when he issued his Tractoria epistula, only extracts of which survive (Augustine, Ep. 190; Celestine I, Ep. 21; Prosper, C. coll. 5.3), in which it appears that he amended his earlier acceptance of the orthodoxy of Pelagius and Caelestius and excommunicated them and their teachings, but only to the extent that he no longer opposed the imperial edict and was sufficiently in agreement with the position of lnnocent that the Africans would not object, without probably accepting that his position really had changed (Wermelinger 1975: 204-218; Carefoote 1995: 260-269 ). From the fragments, we see Zosimus affirm the reality of original sin and the reality of its forgiveness in baptism (Augustine, Ep. 190.23), of the need for divine grace as established in Scripture (Celestine, Ep. 21.9 ), and of the primacy of that grace (Prosper, C. coll. 5.3) (Floƫri 1955). While the Africans rallied around Zosimus and promoted the idea of his unwavering orthodoxy, put forward to marginalize Julian of Aeclanum, whom together with eighteen fellow bishops Zosimus had to excommunicate when they resisted Zosimus' change of heart, the fact that the Tractoria epistula was not preserved probably indicates a lingering frustration with it by the Africans.

 

Meanwhile, in Italy there were now those who thought Zosimus did not go far enough and those who thought he had gone too far. The division in the Roman clergy led to a delegation going to Ravenna in opposition to Zosimus (Ep. 14; Dunn 2016b), although it is a matter of conjecture which type of opponent went to Ravenna. This division plagued the Roman Church after Zosimus' death in December 418 in an electoral controversy over a successor, which, in part, must have been caused by theological divisions in Rome over grace, free will, original sin, baptism, and Zosimus' handling of the affair. (Geoffrey D. Dunn, “The Creation of Pelagianism: Orosius, Roman Bishops, and Marius Mercator,” in The Oxford Handbook of the Pelagian Controversy, ed. Anthony Dupont, Giulio Malavasi, and Brian Matz [Oxford: Oxford University Press, 2025], 403-4)