The period between the Council of Ephesus (431) and the Council of Chalcedon (451) laid the groundwork for the controversy of the latter. St. Cyril's explicit use of a single-subject Christology that at the same time embraced the two natures of God Incarnate, still sought a precision of terminology that was only gradually being developed.
Orthodoxy and Education: https://tinyurl.com/OrthodoxEducation
Doxamoot 2024: https://tinyurl.com/Doxamoot24
Dr. Jenkins new website with Atheism course: luxchristi.co (note, not .com).