Nicene and Post-Nicene Fathers: Series II/Volume III/Theodoret/Letters/Letter 148
CXLVIII in the Edition of Garnerius.
Is “the minute of the most holy bishop Cyril, delivered to Posidonius, when sent by him to Rome, in the matter of Nestorius.” (Cyrill. Ep. XI. tom. lxxvii. 85.)