The Church Fathers · c. 543
Against the Nestorians and Eutychians
Leontius of Byzantium · c. 485–c. 543
What it is
A technical defence of Chalcedon arguing that Christ's humanity has no independent person of its own but subsists within the person of the Word.
Why it lasted
The concept that let Chalcedonian christology answer its critics, and the foundation of all later Byzantine christology.
Where to read it
This work is in the public domain and can be read in full, free, at the archives below. The Library catalogues it; it does not host the text.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
Read next