These two points may be summarised.
Monophysites (condemned 451 at Ephesus) insisted on One Nature, to defend One Person:
opposing
Nestorians (condemned 431 at Chalcedon), who insisted on Two Natures almost, if not quite, to the assertion of Two Persons.
[Transcriber's note: refer to Footnote 1 on page 176 referring to an error in the above two paragraphs.]
The date is limited in lateness by the above. It must have been before the middle of 400-500, i.e. before the complete development of the controversy condemned in 451.
And it could not be earlier than 416, because it plainly condemns Apollinarians, who denied a human Soul to Christ, and said the Godhead was in place of a human soul (360-373): and because several of S. Augustine's expressions appear in it, whose books on the Trinity appeared about 416, and later.
Moreover the 'Filioque[1]' appears in it, and S. Augustine was the first to give this prominence.
Thus the date is fixed between 420 and 440.
And it is Latin, in the construction of its Sentences, not Greek; and
Gallic, in its first reception, and chief, earliest, and most numerous,
MSS and commentaries.