Work dossier · summary and historical context
Cyril of Alexandria's 'Responsiones ad Tiberium diaconum sociosque suos' is a fragmentary Greek responsa text defending Cyrillian Christology against objections attributed to a deacon named Tiberius and his associates. The work survives only through later epitomes and catenae, with no complete manuscript tradition. It employs a dialogical structure of lemmata (objections) followed by solutions (ΕΠΙΛΥΣΙΣ), citing Scripture and even pagan philosophers to argue for the Son's perpetual divine presence against adoptionist or radical Antiochene views. The text was cited at the Council of Ephesus (431) as a witness to Cyril's orthodoxy but never entered Byzantine liturgy. The khazarzar edition lacks a critical apparatus, making textual verification impossible.
The work matters as a direct witness to Cyril's Christological arguments during the Nestorian controversy, showing his use of Scripture and pagan philosophy to counter adoptionist views. Its citation at Ephesus 431 underscores its early authoritative role. It relates to other Cyrillian responsa and to the broader Antiochene-Alexandrian debate, though its fragmentary survival limits its impact.
The work is usually dated to the 420s–430s, during the Nestorian controversy, though the text itself provides no internal date. Cyril of Alexandria (c. 376–444) wrote it in Greek, likely in Alexandria, for a community engaged in Christological debates. The sole surviving Greek manuscript tradition is fragmentary; the khazarzar edition relies on later epitomes and catenae, not a complete codex. The work was cited in the Acts of the Council of Ephesus (431) as a witness to Cyril's Christology, indicating its early authority, but it never entered the Byzantine liturgical tradition. Its transmission is thus indirect and partial, with no known Coptic or Syriac versions. The dialogical structure (objection and solution) is typical of Cyril's responsa literature, but the precise textual divisions are editorial.
Apparatus · what the pipeline recorded
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