The article examines the Council of Constantinople of 879–880 as a historically situated event of restoring ecclesial communion after the Photian crisis. Its point of departure is not a general ecclesiological scheme, but a close reading of the horos, the canons, the papal instructions to the legates, the letters of John VIII, and the later reception of the council. The study first places the council within the sequence of conflicts between Ignatius and Photius, Roman intervention, the Bulgarian jurisdictional question, and the relation between the councils of 869–870 and 879–880. It then offers a philological reading of the key terms of the horos: ὅρος (horos), σύνοδος (synodos), κοινωνία (koinonia), πίστις (pistis), and προσθήκη (prostheke). Particular attention is given to the formula οὐδὲνἀφαιροῦντες, οὐδὲνπροστιθέντες, οὐδὲν ἀμείβοντες, by which the council protects the unchanged inherited creed. The Filioqueis therefore interpreted both as a pneumatological issue and as a question of ecclesial au-thority over the common symbol of faith. The article argues that the council of 879–880 may serve as a theological model of ecclesial unity only if it is read without anachronism: as a synodal and canonical restoration of communion that allows disciplinary compromise but does not allow alteration of the common confession of faith.
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