When Emperor returned to Constantinople in 482, he issued his famous to the Christians of the world in Alexandria, Egypt, Libya, and Pentapolis. In it, he confirmed the of the Fathers of the Councils of Nicaea and Constantinople; nothing, however, is mentioned concerning the Councils of Ephesus and Chalcedon. condemned both Eutyches and Nestorius and confirmed the of St. Cyril as expressed in the 12 chapters.

The confirmed also the title of for the Virgin Mary, and refuted the formula of the one hypostasis (person) in two natures, which was rejected by the Alexandrians. The text was balanced in a way for it to be accepted by Chalcedonians and non-Chalcedonians.

It avoided difficult theological issues and aimed to restore a position prior to that of Chalcedon. Mongos accepted the in Alexandria. Although did not succeed in his attempt, he is well thought of and remembered in the Coptic Church.

According to tradition, his daughter went to Scetis and disguised herself as a monk. She interceded for the construction of the monastery fortresses. She is commemorated in the on the 21st of Tubah.