I know from Encyclopaedia Britannica that two of the three of his Letters to Nestorius were accepted by Council of Ephesus, AD 431 and later on by the Council of Chalcedon (right?).
I know the Third Letter was accepted by the Council of Ephesus, AD 431 and presumely later by the Council of Chalecdon. However, was it the First or Second Letter that were also accepted? Judging from the higher amount of search engine results the Second Letter gets over the First, I'm guessing its the former.
Cyril and the Chalcedonian Creed- His Letters to Nestorius
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