St. Cyril of Alexandria's trinitary doctrine

St. Cyril of Alexandria’s theology is considered generally within the framework of his christological polemic with Nestorius, whereas the saint’s triadological teaching is much less common in russian-language patristics. This article presents a summary of St. Cyril’s doctrine of the Trinity on the basis of his anti-Arian writings written before the beginning of the Nestorian crisis (428) (“The Book of Treasures about the Holy and Consubstantial Trinity”, “Dialogues about the Holy Trinity”, “Commentary on the Gospel of John”). The article examines such components of the saint’s trinitarian doctrine as the Hypostases’ names and modes of existence, the Trinity Persons’ mutual relations, the issue of the Holy Spirit’s procession, the continuity of theology and economy, the Hypostases’ deployment and unity, the Persons’ co-existence, the concept of the Trinity as a sequence of images. Special attention is paid to the terminological apparatus of the saint’s trinitarian discourse.