This document did not appear in the original edition of the Letters. A fragment in Latin was published in the Auctarium of Garnerius. The complete composition is given by Schulze from a ms. in the Imperial Library at Vienna. The date may be assigned as early in 431. As Cyril had weaned the monks of Egypt and even of Constantinople from the cause of Nestorius, so Theodoret attempts to win over the solitaries of the East from Cyril.