With the apparent purpose of bringing the orthodox and heretics into unity, Peter Mongus and Acacius of Constantinople had elaborated a new creed in which they condemned expressly Nestorius and Eutyches, but at the same time affected to pass over the decisions of the Council of Chalcedon and rejected them hypocritically.
When reports of this reached the Apostolic Throne of Saint Mark, Pope Saint Cyril I of Alexandria acted quickly to correct this breach with orthodoxy, requesting that Nestorius repent.
The work includes a number of quotations from standard authors such as the Cappadocians, John Chrysostom and Cyril of Alexandria, and also Pseudo-Dionysius, but also from a number of authors condemned at various councils (e.g. Apollinarius, Eunomius, Eutyches, Nestorius, Paul of Samosata, Valentinian).