Work dossier · summary and historical context
The Expositio fidei is a systematic exposition of Nicene orthodoxy attributed to Marcellus of Ancyra, composed around 340 CE. It defends the homoousian doctrine against Arian and Sabellian interpretations through doctrinal argument and scriptural citation. The text survives only in fragments preserved by later authors, notably Eusebius of Caesarea and Epiphanius of Salamis; no complete manuscript is extant. Its register is polemical and doctrinal, reflecting the theological controversies of the mid-fourth century. The work was cited by both supporters and opponents of Marcellus in the 4th–5th centuries but was never included in later patristic collections as a standard authority. The edition is based on reconstructed fragments, so the original sequence and completeness of the argument cannot be verified.
The Expositio fidei is significant as a key witness to the development of Nicene orthodoxy in the mid-fourth century, particularly in the Greek East. It reflects Marcellus's attempt to articulate a non-subordinationist trinitarian theology while avoiding Sabellianism, and it was cited in later debates about the Son's likeness to the Father. The work's fragmentary survival illustrates the challenges of reconstructing lost patristic texts from quotations in later authors.
The Expositio fidei was likely written by Marcellus of Ancyra around 340 CE, after his deposition at the Council of Constantinople (336) and before his condemnation at the Council of Serdica (343). Marcellus was a prominent defender of Nicene orthodoxy in the Greek East, but his theology was controversial for its alleged Sabellian tendencies. The work was composed in Greek, probably in Ancyra or a nearby region, within a community engaged in the post-Nicene trinitarian debates. The text survives only in fragments quoted by later authors, especially Eusebius of Caesarea (who opposed Marcellus) and Epiphanius of Salamis (who preserved some material). No complete manuscript is extant, and the original sequence and completeness of the argument cannot be verified. The work was cited in the 4th–5th centuries by both supporters and opponents of Marcellus, but it was never included in later Greek or Latin patristic collections as a standard authority. Its transmission is thus fragmentary and mediated through hostile or selective sources.
Apparatus · what the pipeline recorded
| Coptic | Rendering | Count | First |
|---|---|---|---|
| no glossary terms recorded | |||