Work dossier · summary and historical context
De Professione Fidei is a polemical treatise by Lucifer, bishop of Cagliari (d. 370/371), defending Nicene orthodoxy against Arian or Homoian opponents. Written in Latin, the work survives in a single 9th-century manuscript (Paris lat. 13368) and was likely composed in the 360s, after the Council of Alexandria (362) but before Lucifer's death. The treatise reflects Lucifer's uncompromising stance on the Nicene faith, contributing to the later term 'Luciferian' for rigorist schismatics. Its limited transmission and lack of critical edition leave textual uncertainties unresolved.
De Professione Fidei is a key witness to 4th-century Nicene polemic and the uncompromising stance of Lucifer of Cagliari. It illuminates the theological and ecclesiastical conflicts after the Council of Alexandria and the hardening of positions that led to the 'Luciferian' schism. The treatise also shows the survival and transmission of anti-Arian Latin works in Carolingian manuscripts.
Lucifer of Cagliari was a leading Nicene bishop in the 4th-century Trinitarian controversies, opposing Arian and Homoian theologies. De Professione Fidei was likely written in the 360s, after the Council of Alexandria (362) which sought to reconcile moderate Nicenes, but before Lucifer's death in 370/371. The work survives in a single 9th-century manuscript (Paris lat. 13368), indicating limited circulation. Lucifer's writings were cited by Jerome and later medieval polemicists, but the treatise had no liturgical use and was not included in standard patristic collections until the 17th century. The source edition (ogl-pl) lacks a critical apparatus, so variant readings from other witnesses are unrecorded. Lucifer's rigorism later gave rise to the term 'Luciferian' for schismatic groups, though this label should be distinguished from his personal views.
Apparatus · what the pipeline recorded
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