Work dossier · summary and historical context
The 'Nestorii Tractatus Contra Haeresim Pelagii Seu Coelestii' is a polemical treatise by Marius Mercator, a Latin writer contemporary with Nestorius, attacking the Pelagian and Coelestian heresies. It survives in a single manuscript tradition (Ogl-pl), a later copy with no autograph or early witness. Dating is uncertain but likely from the early 5th century, during the Pelagian controversy (c. 418–430). The text contains technical theological terms like 'gratia' and 'libertas' with specific authorial usage. It was cited by later Latin authors such as Prosper of Aquitaine in anti-Pelagian florilegia, but not widely copied in the Middle Ages, gaining attention only in early modern confessional debates.
This treatise is significant as a direct Latin polemic against Pelagianism from a contemporary of Nestorius, linking the Pelagian and Nestorian controversies. It provides insight into early 5th-century theological debates and the reception of Pelagian ideas in Latin Christianity. Its citation by Prosper of Aquitaine shows its influence on later anti-Pelagian florilegia, and its survival in a single manuscript highlights the fragility of early Christian texts.
The treatise was likely composed in the early 5th century, during the height of the Pelagian controversy (c. 418–430), probably in Latin-speaking North Africa or Rome, where Marius Mercator was active. Mercator, a contemporary of Nestorius, wrote to refute the teachings of Pelagius and Coelestius, which emphasized human free will over divine grace. The work survives only in a single manuscript (Ogl-pl), a later copy, with no early witnesses; its transmission is inferred from internal and external references. The text was used by later anti-Pelagian writers like Prosper of Aquitaine, but it was not widely copied in the medieval period, resurfacing in early modern confessional debates. The attribution to Mercator rests on stylistic and historical parallels with his other works, though the evidence is thin.
Apparatus · what the pipeline recorded
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